Remember to drink one quart of water per every 50 pounds that you weigh each day. If you’re not used to drinking enough water for your body, gradually work your way up to the right amount.
Any good filtered water is allowed on the plan. Reputable bottle water companies are Fiji, Volvic, Arrowhead, Trinity, and others. The number and quality of purified waters has increased in recent years. Reverse osmosis water is a good option for home water filtration systems.
The most important note here is to make sure it is filtered and that you are not drinking tap water.