mud snakes usualy pose no problems as far as care, you can give them a setup similar to a northern water snake of similar size, but with a larger water bowl. in old conant field guides, it is stated that they can be house in a fully aquatic setup-but i would be very cautious and moniter the mud snake closely. they usualy eat well on sirens, tadpole and long bodied fishes in captivity, i had a pair for two years kept this way, but they have LARGE clutches. good luck
justin