I learned all about using a snake bite kit when I was in the Boy Scouts back in the '70s. Here in the 21st century, the consensus is snake bite kits are either useless or could do more harm than good. They don't contain the one thing you actually need which is antivenum. Only a good hosptial ER will have antivenum. So, the current consensus is to get the victim to a good hospital ER as soon as possible. Any other "remedies" are a wasted effort and, again, could actually do more harm than good.Keep a good snake bite kit with you if heading to the river by my place.
That's how I undertand it anyway. This organization appears very credible and agrees: