I `ve read that if we do not drink enough amount of water when we take creatine there is a risk of dehydration.How can we avoid this? How much water we need when we take creatine?

oooh yeaaa...Theres definitely a big risk of dehydrating if you're not drinking enough water, especially if you're taking any supplements such as creatine. Even without taking creatine, you should aim to consume atleast 1-2 gallons of water a day. If you stay within this range, you should be alright.