I actually picked up this idea back when I had puffer fish.
Snails are a great occasional food for a turtle.
She'll contains a lot of calcium
Live snails provide good nutrition
The chewing the shell is good for the turtles beak
Again don't over feed as anything with a lot of protein
If you go to any pet store , you'll notice many of their aquariums have the small snails that arnt for sale they generally come from live plants. These snails breed very fast and are generally just a pain in the butt for pet stores.
I personally go to pet smart and ask them to sell me some and more often then not they go talk to their boss and the boss say just bag them up and give them to me for free. The odd occasion they will charge me 10c.
There's 2 basic types of these snails the more oval or round shaped snail and then the unicorn horn shaped ones.
Ideally you want the round or oval shaped ones as a turtle can crush their shells no problem. The unicorn shaped ones have very tough shells and you could use them but your turtle would prob have to swallow whole.
If you make trips to the pet store often then you cN pick up 10 here and there as a turtle snack.
If not, breeding these snails is very very easy. Get a 1-2 gallon jug tank anything. Fill with aquarium water and a little bit of substrate. Crush turtle food to feed the snails and within a week or 2 you'll probably see some babies crawling around.
Every couple of days remove like 50% of the water and replace wih new quarium water. The snails lay eggs that stick to the a surface so you won't remove the eggs when changing out some water
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