Press, Flip, Hydrate. Simple! What to consider when buying the best gallon water bottles So let’s get one thing out of the way: You don’t actually need to drink 8 cups of water every day.

Fitness tipsters say drinking a gallon of water per day can help with weight loss and building muscle. Two doctors and a nutrition expert share insight into whether this fitness tip is true.

While drinking a gallon of water per day may be appropriate for some people, it may be too much for others. A good way to know if you need to increase your water intake is to look at your urine.