[KITKAT]

Garters eat fish. They often live in the ecotone around water.

However, Dekay's are more of a meadow and forest ecotone species, and would not have access to bodies of water. They do not eat fish.

In nature, the Dekay's eats nightcrawlers, slugs, terrestrial snails, and perhaps soft bodied insects. The only soft bodied insect we have readily available on a commercial scale is the waxworm. These are very soft, and might be accepted, but they are also VERY high in fat and phosphorus. If your snake will accept them, feed them very sparingly.

Your best bet to get started is to visit a good bait store and get a dozen nightcrawlers.