I'm unsure of where this information is coming from about Gerrhosaurs liking water and coming from streambank areas. All of the species of Gerrhosaurs are from dry arid scrubland type habitats and are anything but tied to water. In fact several source mention they have modest water needs and tend to acquire a lot of water through their food as most arid region lizards do. Still provide them with a water bowl. I haven't noticed mine dangling their feet in the water bowl but they frequently will stand with their front legs in the bowl in order to drink.
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Matt Campbell
Animal Keeper, Small Mammal/Reptile House
Lincoln Park Zoo Chicago, Illinois

Assistant Curator
Wildlife Discovery Center at Elawa Farm
Lake Forest, Illinois