Yes they are not bad for you
Slowly.
I have a large apple snail, about a baseball size. I feed it only with Romain lettuce. It survives well.
leaves!
leaves
Algae, so you don't really need to feed them as they "feed" themselves.
feed it
Nope.
there in water
You can feed it Saltwater, Honey, Sugared water, Cane sugar
Twice a day
Damp areas, with plants to feed on.