A camel
As with most animals, they drink water when it is available.
Desert animals stay dry when it rains. When the rain stops, they come out to drink water.
They drink water when irt is available but can also absorb some water from the plants they eat.
To drink water
Medical practitioners advise drinking an average of 2 litres of water per day normally. Soldiers in the desert drink up to 5/6 litres per day. It really depends on how much you're going to exert yourself while in the desert, and how hot the temperature is.
Desert Rat (Gerbil) Kangaroo Rat
They can walk great distances in the desert places that humans usually cannot. They hold gallons upon gallons of water in their humps (they can drink 36 gallons in 6 minutes) and can actually sense bad water from good water, and won't drink it if it is bad. (Good way to know if your water isn't poisoned.)
30 gallons in 10 minutes
Tiny Kangaroo Rat of south western desert of USA
A moose can drink 37 gallons in a day!
Desert snakes drink water. They may get it from cacti, or oases.
In the desert.
Some cactuses in the desert have water in them
They can walk great distances in the desert places that humans usually cannot. They hold gallons upon gallons of water in their humps (they can drink 36 gallons in 6 minutes) and can actually sense bad water from good water, and won't drink it if it is bad. (Good way to know if your water isn't poisoned.)
A Giraffe needs to drink around 2 litres of water every dayA giraffe needs to drink because if they don't drink water they can get very sick.
You cannot drink 12 gallons of water at a time: you will throw up before you get all that down.Having said that, yes, you will die. You WILL drink more than 12 gallons of water during your life and, irrespective of how much you drink, you will eventually die.
Well yes, they can drink camels milk (Traditional in the desert), they could also drink very limited amounts of fruit juice, but a horse does need water to survive, typically 0.5 to 1.0 gallons per 100 pounds of bodyweight.