Reddit mentions of Sterile Syringe Filters PVDF 25 mm Diameter 0.22 um Pore Size Individually Packaged 10/pk by Biomed Scientific

Helpful info on the best water to use.
I use cold tap water. I also filter through a micron filter into 10ml amber glass resealable vials. I make my own bacteriostatic water by doing cold tap water with .09% benzyl alcohol. This ends up being 9.1ml of water and .09ml of benzyl alcohol. The benzyl alcohol I get comes in a 50ml resealable sterile bottle.

Here's a link to the 27 gauge 1.25" 3cc sterile needles I get. It comes as one unit with the needle already attached to the syringe. I get my vials, benzyl alcohol, needles, and alcohol wipes from medlabsupply. They have way cheaper pricing and everything you need is on there. Just make sure to get everything you need all at once to avoid paying too much for shipping. I use these 10ml syringes for making the actual solution. You can reuse these as long as you use a fresh micron filter as it will filter any potential bacteria.

You should really research how to do IM injections to avoid getting any abscesses/infections as you can lose a limb. IM is much less forgiving than IV as it's very easy for bacteria to spread in muscle tissue so infection needs to be taken much more seriously. You should be using a fresh needle every time, using alcohol wipes to wipe the top of your bottle of solution if you're using a premade solution, and wiping your injection site before you shoot it every single time.

I'd suggest making solutions since using a micron filter is much safer than a cotton ball. It makes it easier since you can just filter your entire solution at once and use only a single wheel/micron filter for one or two solutions (assuming your doing 10ml solutions). Then your whole vial is filtered and sterile and you don't have to worry about it until you go through the whole vial (1 gram of k per 10ml vial).

As far as injection sites the thigh is definitely the easiest and most forgiving. I'd say glutes are second. I just alternate between each thigh muscle personally. If I did it more often I'd do each thigh muscle and then one or both glutes (choose the one on the same side as your dominant hand if just doing one).

Here's a link that shows your how to find the site properly. Here's another one showing injection sites, how to find them, and how to do IM injections safely. This one is a good video for finding the injection for glutes and where your sciatic nerve is. Even after you know how to find the sites you should still look up images of the nerves that run through the given muscle you plan on injecting into. That way you can know exactly what you're avoiding and it'll will prevent accidentally hitting one.

Filters that filter out bacteria and all the nasty fillers that are in pills
Like this: https://www.amazon.com/gp/aw/d/B06Y15LBZ5/ref=mp_s_a_1_5?ie=UTF8&qid=1518571534&sr=1-5&pi=AC_SX236_SY340_QL65&dpPl=1&dpID=31mI8BAp-nL&ref=plSrch

Listen, this is what you need to do TODAY, NOW.

1. Go online on Amazon or another website and buy her 100 clean sterile syringes that are 27, 28, or 29 gauge luer lock 1ml. The higher the number the better (up to 29), but 27 is fine.
   
2. https://www.amazon.com/Diameter-Individually-Packaged-Biomed-Scientific/dp/B06Y15LBZ5/ref=sr_1_2?keywords=micron+wheel+filter&qid=1562185313&s=gateway&sr=8-2
   
3. Get her alcohol swabs
   
4. https://dancesafe.org/product/fentanyl-test-strips-pack-of-10/ Buy her some of these it's VERY important.
   
5. Buy two of these, needs to be two of them https://www.amazon.com/AdirMed-Sharps-Bio-Hazard-Disposal-Container/dp/B079TLTRXR/ref=sr_1_1_sspa?crid=113GHOFD5RKQQ&keywords=syringe+container+disposal&qid=1562196502&s=gateway&sprefix=syringe+container%2Caps%2C902&sr=8-1-spons&psc=1
   
6. Buy two soda can and cut the bottoms off about an inch from the bottom, cut evenly. She can cook her dope up without using someone else's can/spoon/etc. (spreads HIV/Hep C/Hep B). (PM me your region...depending on her type of dope she may not or should not be heating it up.)
   
7. Tell her if it tests positive for fentanyl, and she's too poor to consider just throwing it away, She should mix up all the dope she bought in one mix, using the same amount of water she injects her bag/dose that she normally does (yes multiple normal doses), POP OFF the needle part of the syringe, and draw up a 0.5ml dose (half as much liquid as normal, half the dose of normal) and squirt a tiny bit up her nose, just a little bit at a time and not all at once, maybe a little squirt every 5-10min ( 30-45min is best but let's be real junkies won't wait). From there she can figure out the potency. If she mixed up say 5 normal doses in one big batch all together and let's say the dope is 80% as strong as her normal dose get her high/well she now knows the other 4 doses are exactly the same strength. Fentanyl mixed in dry powder is SO dangerous.
   
8. Please PM me your general region (nothing more than say your state is needed) and/or country so I can give advice to pass on (whether she should heat up her dope or not, etc.) As well as direct you to other phone numbers to help her.
   
   This stuff will keep her alive MUCH longer, giving her longer to have a chance to get help. It will reduce her chance of IV damage by 99%, reduce chance of Hepatitis C/HIV by almost 100%, and she's less likely to OD.
   
   This should be the ONLY support you give her besides an offer for a free ride and paid for methadone program (if she passes her future drug tests), and don't you dare give her too much equipment all at once or she might be dumb enough to try to resell it. Maybe give her say 10 sets of each (alcohol pad, filter, fentanyl test strip) and maybe a few extra stringes (15-20?). Then wait and see how long until she comes back for more. Eventually you can figure out a spot to stash each "set" near the house but outside in something that won't damage it, assuming you don't want her seeing you or the kid.
   
   Tell her that every time she comes back, either you'll personally exchange it or she'll know where you put the new set outside the house, that she NEEDS to put all her used needles WITH THE CAP ON ALWAYS, the used filters, and the used fentanyl strips and anything else all in the red sharps container, and to take the new/empty container with all the new stuff with her. TELL HER if a single syringe or anything in these kites except the alcohol swabs are missing or the count is short, you will either start giving her less or cut her right off. That way she doesn't just sell this stuff hopefully. (Don't actually count that crap or even touch it; you should just dump it all into massive empty cardboard box inside another cardboard box, and keep it out of reach of your child. Eventually when it's too full, close the flaps and tape up the box inside a box and trash it).
   
   Apart from offering her a free ride to a methadone clinic and offering to pay for her methadone as long as she never fails a drug test after getting in the program(seriously never offer to pay for this more than the first time she fucks it up), give her absolutely nothing apart from maybe a home made sandwhich the SECOND time she visits for more injection stuff, not the first (so you can tell for sure how often roughly that she needs more IV supplies without worrying she's coming extra often just for the sandwhich).
   
   If she can manage say 30 days on the program without testing positive/getting kicked or or getting arrested, maybe you'll "consider changing your living arrangements." (BE VAGUE and promise nothing in stone or anything specific.