Crabs can survive for hours if shaded from the sun and if you keep the rag in the bucket moist. These are sold in convenience stores and bait shops. To cook your crabs, use a large pot. Some like to steam their crabs, whereas others prefer to boil them. Choose a method, add water to your pot, and bring it to a boil.
Some people add crab boil, found in grocery stores.
I prefer Old Bay seasoning, a red, Maryland-style mix that adds some spice to the crabs. Carefully add your crabs to the pot and dust them with the Old Bay. When they turn bright orange-red, they are ready to eat. Catching crabs is easy. Cooking crabs is easy.