When I was 12, my pet hamster got loose and drowned in my dog's water bowl.
And you're still looking for any excuse to get another airgun, to this day .
There is actually a kind of mouse or rat trap you can make at home that works by drowning. Fill a deep container (like a home depot bucket) with water. Make sure the water level is low enough that a mouse can't swim out once it falls in, but high enough to drown a mouse. Place the bucket where you have seen rodent signs, in an area where they can reach the top of it (like on the floor next to a pantry shelf or a window ledge). Put a dab of peanut butter/cracker in the center of a light sheet of newspaper, then carefully place this newspaper over your bucket. The next rodent that jumps on that newspaper to reach the bait is going to fall inside and drown. You will find the body in the morning, and can dispose of it and reset the trap as much as you need.If you want to live-catch without drowning, just leave out the water. You will find a mouse at the bottom of a deep bucket, who can't jump out the steep sides.