Mr. Cheetah's statement's about himself are based on fact:
Cheetahs are not actually the fastest land animal. See, speed can be measured as either the distance someone travels in a period of time, or the number of body lengths a person can travel in a second. The tiger beetle does 171 LENGTHS PER SECOND, compared to the cheetahs 25.
Cheetahs still need water, but it's possible that they can go a while without much water.
Cheetahs are the only cat species that cannot retract its claws, This gives it grip so it can go faster and make sharp turns easily while chasing prey.