Hamster vs water bowl

[Hamlet22]

I have a young dwarf hamster (Hamlet) and I was going to get him a water bottle but the pet stores here are selling them at ridiculous prices so I got him a little bowl instead. He can reach it and has no problem drinking from it (except on the first day I got him when he accidentally half-slipped into it, but luckily that hasn't happened again), my main problem with his water dish is that at night he's very active and he always gets bedding into it while he's burrowing or moving his toys around. I know it isn't a big issue to his health in any way because I clean it and fill it up with clean water every day but it's wasting quite a bit of bedding. Is there any way I can prevent this?