They are built to not need as much water and to retain their water better. They eat plants with moisture. They don't lose moisture or sweat a lot like we do or as soon as we would and body temperature can go higher than many animals before they begin to lose moisture. During hotter weather they drink about every 7 to 10 days and may drink 5 gallons at that time but if the weather is cooler they don't need to drink that much and may even refuse water. Their kidneys and intestines are better at retaining water than most other animals. When a camel twitches their nose they are conserving water, they are closing their nose and taking back in some of the water they would have been exhaling and then exhale the carbon dioxide.
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