What can I use to kill snakes?

Do you mean if one comes at you in the wild? Or to kill the ones in your house/on your property? When there was one in my house I used a bat because it was on hand. Most people use a hoe to sever the head from the body (bats are probably the least efficient...).

If you can, let a professional kill it so you don't get bitten. Call professionals to exterminate since doing it all your self can take a lot of patience and time.

But if you want to do it yourself (exterminators can be pricey!), purchase snake traps (online or in some gardening store) and set them around (damp places are best). Once they're captured you can kill them or release them more easily.