if you don't wish to take pills, can go for tampon.

Actually, when you're inside the water, it wont leak out due to water pressure outside, but once you come out from water, the water pressure is gone.

Im using tampon since few years ago and after that i never use pads anymore. you have to find your comfortable way to insert it in.

GreenNerdy is right, you have to change once you got out from water to beware of infection.

Snorkeling will only equipped with a diving mask, a shaped tube called a snorkel. You have to wear your own swimsuit and with a life jacket only.

For tampons, i suggest you go for the smallest size. There's 3 sizes for Johnson & Johnson brand.
Those other sizes make me pain even im not XXXXXX

Playtex tampon comes with applicator, means tat you dont need you finger to insert it in.
But the application just too big for me.