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Many gecko species kept commonly in captivity are desert species which are more accustomed to getting their moisture from damp sand or licking dew from leaves and stones. They may never encounter standing water (ie, a water bowl) in the wild, and might not know how to drink from one.
You can keep desert geckos hydrated by offering an area of moist sand underneath a hide box (such as an inverted flowerpot with a "door" chipped out of the side), and by daily light spraying or misting in the cage.