Here are some helpful tools IF someone has to dose a snake orally. (not saying that is what OP should do, just a FYI)
Not everyone has a professional dosing kit at home, but this works as well..
Cheap dropper, found at most walmarts or drug stores, nice and smooth and not to wide, so can be inserted deeper down the throat to make sure the medicine goes down. I recommend taking fine sand paper and running it over the edge of the dropper making it sure its completely smooth and soft so it doesn't scrape the throat. Works well with smaller amounts of meds.
If you need to give larger amounts of meds but want the smoother and narrower tube (rather then a syringe) this is a good option. Usually found online. Can also be smoothed out with sand paper to make it soft and smooth at the opening.
I have these speculums at home. Have ever only needed them once, but they are good to have around. Holds the mouth open safely while you insert the droppers into the mouth/neck. That can be done without a speculum, too, it just makes it easier. There is also a plastic version..
Hold the snake with the head and upper body elevated for at least 30 seconds or so to make sure the meds go down into the stomach.