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The foldable seat is a good option but we just use one of those that sit on top of the toilet. We have like a drawstring back pack that we only use for the seat and carry it around for the first few weeks until they get more comfortable with the big toilet and can hold themselves up better. This is the exact seat we use: https://www.amazon.com/Munchkin-Sturdy-Potty-Seat-Green/dp/B01C431OA0/ref=zg_bs_166889011_2?_encoding=UTF8&psc=1&refRID=59QHR5YB4BM3HRE8FJ8G

I don't have advice on the training aspect. I suspect he will regress a little when starting a new day care. Sometimes, though, watching the other kids help. At that age, other kids teasing won't be an issue.

As far as limiting the mess, my son wears padded underwear with wool shorts when going out. This contains a surprising amount of pee. These cheap kinds worked well for us (but our kid is a different size and shape) https://www.amazon.com/gp/product/B01MSFGX8S/ref=oh_aui_detailpage_o09_s01?ie=UTF8&psc=1 and https://www.amazon.com/gp/product/B07FGDSSH5/ref=oh_aui_detailpage_o02_s00?ie=UTF8&psc=1

Putting wool pants or shorts (sometimes we use the shorts under other pants) really contains the mess. Look into cloth diapering guidelines for washing and lanolizing (making water resistant.) These are expensive but you only need 2; you can get cheaper ones on Etsy re-purposed from sweaters. This is one we have https://www.greenmountaindiapers.com/collections/wool-diaper-covers/products/babee-greens-wool-shorties which is super comfy, but not good for dirt. You can get all sorts of colors and designs; if you are interested I can give you some specific brands to start. I swear when they get pee on them you only need to wash them occasionally (like once a month, but it really probably be hand wash). No it does not smell or feel gross. Look it up; it's crazy.

So if I were in your situation, I'd buy a ton of padded underwear, so he could still feel the leaks and be in underwear. Then I'd buy one pair of wool shorts and one pair of wool pants to wear over that. (And then up it to two for washing later. They'd probably dry overnight, but not every day.)

Put the diapers back on and try again in a few months. She might not be ready now. Potty training is developmental and it happens at different times for everyone. My girl just recently potty trained at 3 years and 3 months. She did it mostly on her own and just decided for herself. I got a princess potty that plays music when she pees in it and a Kitpotty princess kit and she got into it. This past week she pooped in the potty for the first time and before that she was going and putting on pull ups to poop. Just take a break and try again later. She will get it!

I’ve bought one of these for when the time comes

OXO Tot 2-in-1 Go Potty for Travel - Navy https://www.amazon.com/dp/B0771SDJDF/ref=cm_sw_r_cp_api_i_g76DDbFSY34SP

Comes with bags you just throw away when they are done.

Training pants?

Gerber plastic pants: https://www.amazon.com/Gerber-Plastic-Pants-32-35-pairs/dp/B000KPZS34/

I also use these disposable seat covers and both my kid and the folded seat never touch the toilet. The folded seat comes in a waterproof travel bag and I wash both the seat and bag with soap and water.