BUY a new one!!! That's the solution. If it's some pricey water bowl,then go get a quick fix bowl for $5 and save a few bucks to buy a new one that you really like. Then again,if you can't afford a water bowl you shouldn't own a pet,God forbid it gets sick. How you going to afford a vet bill if you can't even afford a new water bowl....
Yeah, I failed to see where op mentioned they couldn't afford a new dish, or vet bill.
OP, I'm not sure what would be safe. Most epoxies I've been around smell terrible, so I wouldn't use in a water dish just to be safe.
If nothing ever changed, there would be no butterflies.