We were there in June with 2 yr old DS. They have life jackets available at the marina & various wings, inner tubes for sale at the pool. But not for use. I don't believe they had noodles though. I would check if they would let you have them in the pool, may be a bit big? The pool is great though, it has a zero entry, so the kids can just walk in as deep as they want.
Have a wonderful vacation! Don't miss the EWP from the beach, this was my son's favorite thing at WDW!