We were there last week and they had life jackets available right by the pool. It was cooler, and the pool was getting some use, but not like I would expect in hotter weather. Having said that, the life jacket supply wasn't great even with the lower crowds. If you think you'll use the life jacket, I'd grab one first thing in the morning and store it in your room for later. I'm not sure if this is technically legal but in warmer, more crowded weather it might be the only way to get one. I also noticed that they sold noodles and water wings in the gift shop. I'm assuming those are allowed in the pool if they sell them there. It's not as safe as a life jacket but may be an alternative if you really want to get in the pool and the jackets are gone.
Garland