We saw lots of sm kids' toys in the pools at both AKL and CSR in May. Both resorts have really nice life jackets for the little ones, but the number is not sufficient during busy times. During our 8 days at AKL, we were never able to snag an infant-sized jacket for our 2.5 yo -- and she really wanted to go down the water slide with her brothers!! At CSR, we were able to grab the last one for her one time at mid-day.
In the past, water wings were not permitted in the water parks. This time, we saw lots of them. I wish we had brought ours the day we went to TL. Despite arriving early, the park was so busy that there were no child or infant-sized jackets left for our 2 youngest. Since they are such daredevils anyway, I was a nervous wreck watching them all day. Not a pleasant experience.
You'll find that Disney sells buckets, water balls, and even noodles in most of its pool-side shops.