Reddit mentions of Bormioli Rocco Frigoverre Jug with Hermetic Lid, 68 oz.

search for an "ice tea maker" on amazon from mr.coffee, hamilton beach, west bend. they all make models that brew 2L-3L properly every time. i still use an old mr.coffee TM3 model which is cheap and works great even after 1,000 brew cycles. trust me, i know what i'm talking about - i drink 2-3L each DAY. I use standard dirt cheap 8-12cup coffee filters when brewing loose tea in the TM3. once you find the model you like, double check pricing at walmart.com as they often sell kitchen gadgets at a deeper discount with cheap ground shipping.

be mindful of your sweetener since you drink so much. years ago i switch from sugar to cheap kirkland(costco) sucralose(splenda) which helps keep weight off and my teeth from rotting, but if you don't want artificial, then your only choice is Stevia which may take a while to get used to it's leafy aftertaste. I suggest cheaper bulk Stevioside 90% powder, not any commercial brand. i flavor my tea with an extra ounce per cup of milk, pink grapefruit juice, cranberry juice, or peach nectar, whenever I find them on sale, so no need to buy exotic tea blends, as any robust black or green will do.

one additional suggestion is to be mindful of your tap water quality. i use a counter top canister filter for under $30 that will last for years, and totally removes the chloramines(ammonia taste) from my NYC tap water.

I recommend brewing with broken piece loose teas, not full leaves, since broken pieces will agitate better in a 8-12 cup filter and give you a deeper richer full tea brew flavor and color. my favorite high volume best value black tea brewing would be Dilmah http://www.amazon.com/Dilmah-Ceylon-Loose-4-41-Ounce-Boxes/dp/B00112GBO0 or for a wide flavor blend try Taylors; http://www.amazon.com/Taylors-Harrogate-Yorkshire-8-8-Ounce-Packages/dp/B001E5DXY0 and you only need 1 gram per 8oz cup while measuring i recommend using a cheap $10 digital postage scale since you need to measure by weight not volume(spoons). if you don't want to deal with filters and weighing, use http://www.amazon.com/PG-Tips-160-Bags-17-6/dp/B000YB7XQ4 at a ratio of 1 bag per pint, so for a gallon or 2L-3L i use 8 bags - these are large cotton bags that leave the tea room to agitate - unlike most commercial paper tea bags that can only seep.

in my daily ritual the way my TM3 works is the pitcher is double the capacity of the brew water hopper (presumably so you can add ice cubes to the pitcher). so I double cycle brew the same leaves till my 3L pitcher is nearly full, then I transfer it to any 2L-3L size liquid serving or storage container and add my sweetener there. I use gallon plastic screw cap jugs, but you can go with glass by using http://www.amazon.com/gp/product/B0000DE9B5 to keep the brewed tea liquid from new air exposure. by using air sealed containers you can stock up to a weeks worth of tea in your fridge before a fermentation taste is noticeable on pre-sweetened with splenda or stevia - with sugar the fermentation taste is noticeable by the forth day.

What you are describing is 2 bags every 3 days, so 20 bags a month. Start out with a one time purchase of 7 bags (28 meals) and try it out, you may not like it right away, so eat it for a week. If you don't like it, you can easily sell the remaining bags for what you paid for them and just walk away. If you like it and still want to do like you describe, go with the 21 bag subscription which they call 84 meals.

If you do like it, buy this and one of these to make your life a million times easier and to make the Soylent taste better IMO.

Remember that once you mix up a bag of it, you have 3 days to finish it if it is refrigerated. I would also suggest getting a couple of 1 liter blender bottles, but that is not necessary just more convenient.

So if it's in a fridge and it doesn't take you more than a few hours to get to work, you do not need a thermos. I use this and it's awesome. My Soylent lasts longer than when in individual blender bottles and it is so easy to clean. Plus with 2 litres, it's easy to measure calories as 1ml is 1 calorie

I got one like this at one of those TJMaxx-type discount stores. It's not completely air-tight, I don't think, but it keeps funky smells out, which is really all I cared about. You don't want garlic scented Kool-Aid. ;)