Reddit mentions of Britax Car Seat Waterproof Liner | Moisture Wicking Fabric + No Slip Grip + Machine Washable + Crash Tested

So, here's what we did when we potty trained our older toddler.

The rewards he stopped asking for after a while, and when he was older we let him pick something from the "surprise bucket" at the end of the day if he'd been dry and went without complaining all day.

Nap time/night we tried with and without nappies, went with nappies until he was consistently dry for a few weeks as he was too stressed otherwise.

We had a few hiccups with toilets out, but it was mostly ok. We did get a folding toilet seat/potty and it's been very useful a handful of times. I'd do it if it makes it easier for your kid. Toilet training is more psychology than physical imho.

For the car we got a little seat protector that fits around the seatbelt. Like this.

Piddle Pad

Here you go!

http://smile.amazon.com/Skip-Hop-Stroller-Saddlebag-Black/dp/B00SHYEJ58?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o00_s00
http://smile.amazon.com/Jolly-Jumper-727-Stroller-Caddy/dp/B000JQ4B3C?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage
http://smile.amazon.com/Munchkin-Backseat-Organizer-Discontinued-Manufacturer/dp/B00FROCX7W?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage
http://smile.amazon.com/Sight-Magical-Firefly-Mirror-Safety/dp/B00B7M7CMO?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage
http://smile.amazon.com/Boon-Whale-Drain-Storage-Scoop/dp/B007D1NWD6?ie=UTF8&keywords=boon%20whale&qid=1463974909&ref_=sr_1_1_a_it&sr=8-1
http://smile.amazon.com/Diono-Travel-Pal-Car-Storage/dp/B005NMP6IG?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage
http://smile.amazon.com/Britax-Seat-Saver-Waterproof-Liner/dp/B00E1ABYSC?ie=UTF8&keywords=britax%20liner&qid=1463974959&ref_=sr_1_1_a_it&sr=8-1
http://smile.amazon.com/Diono-Travel-Pal-Car-Storage/dp/B005NMP6IG?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage

Few other things I found while digging in my Amazon orders:

• Trunk organizer. I keep wipes, sunscreen, first aid, emergency food, etc. in this. I have a Prius so there isn't much room, this has helped keep all the random stuff put. I had a bin in back for ages but it just took up too much of my precious space!
  http://smile.amazon.com/BackSeat-Trunk-Organizer-Lebogner-Multipurpose/dp/B014PZWK44?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage
  
  Trashcan/tissue holder. I'm this mom now, god damnit.
  http://smile.amazon.com/High-Road-PuffnStuff-Trash-Organizer/dp/B000HZT89C?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_search_detailpage
  
  Various babyproofing things. I had these cool door stoppers that hook into the hinge, but as it turns out my kid loves trying to jam the door shut even more and actually stripped the holes with the screws. I had to put super glue in the holes while shoving the doors back into place while it dried. I use these now and he hasn't ripped any doors off yet.
  
  http://smile.amazon.com/Safety-1st-Finger-Pinch-Guard/dp/B0035RQF7M?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o01_s00
  
  Baby gates. I like this one. We have 3.
  
  http://smile.amazon.com/Regalo-Easy-White-spaces-between/dp/B001OC5UMQ?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o08_s01
  
  Little knick knack type toys that are really nostalgic for me. I didn't buy many of these things, but I could NOT resist the Mister Rogers trolley. So redeemed, my kid is obsessed with it now.
  
  http://smile.amazon.com/Wooden-Neighborhood-Toy-Trolley-Limited/dp/B004U3TXZG?ie=UTF8&psc=1&redirect=true&ref_=oh_aui_detailpage_o06_s00
  
  Books! I had done so much of the essentials (sounds like you have) that I ended up putting a fair amount of books on my registry. People were more than happy to buy those.