This is one of the only baby shower gifts that is still being used, and my daughter is now 2 1/2! It has always been comforting for her to fall asleep to when a baby, it has the music and light. They make the button big enough for little hands, which is awesome. Right around 14-15 months, she started turning it on herself when she woke up in the night to soothe herself back to sleep! Nice!! Her crib converted to a day bed, so it still hangs on the crib side, where it always has been. She still loves it. Unfortunately the water level looks low in mine too, it always has. But I do think it has also evaporated a little, if that is possible because it's sealed? And no, there is no way to fill it. I would say, mine is at about 3/4 full, and it works just fine. The only negative thing, is that it does drain batteries fast if you have it on the bubble mode a lot, so now I usually keep it on just music w/ the lights. And I keep an extra set of batteries on hand, since my daughter is so used to having it to sleep, I can't imagine running out of batteries in the middle of the night! I highly recommend this toy!