hi I believe there are no rides where a baby can sit with a parent.

They no longer offer fastpass. It is Genie+ now. You buy it daily, per person, in the My Disney Experience app. The pricing varies by day, could be $15/person/day or up to around $30. Don't count on it making your wait shorter. I have seen and heard about 45+ minute waits even after paying for Genie+.

Yes to water. Yes to most food. However, they will inspect your cooler / backpack carefully and it will slow down your entry. Some times are not allowed, alcohol, cutlery, things that need to be cooked, etc. WDW has a very exhaustive list on their website of what is allowed and not.

yes, i would highly recommend it. test track , especially where you get to design your own car, would be very appealing to those ages. soarin' would be entertaining. they would enjoy the seas & the land also. pick a few countries in the world showcase and enjoy

hi you can buy tickets for one day which is much better that wasting money on week passes.

yes there are several hotels nearby that are walkable distance the beach club , the yacht club, the swan, the dolphin we rented a scooter from scooter bug (they have wheelchairs, etc) they will deliver it to your hotel before you arrive so you have it your entire stay make a reservation because alot of people use this service if you rent through disney, it is first come, first serve and the wheelchair cannot leave the park. we were just there in feb 2022 so this is current info

there are water stations and pop refill stations for bottomless refills which are good but exspensive.