People who know about fish, PLEASE HELP!?

Your problem is the bowl. There is no filtration and its very unsanitary for the fish. A single goldfish needs a 20 gallon tank. They are messy fish and the reason they've been dieing is from ammonia poisoning in your bowl. They've been poisoned by their own waste. Next time you buy a fish make sure to do some research first. That bowl should not house any fish whatsoever. Even a betta needs a minimum of a 5 gallon, heated and filtered tank.