Sanjeev, great question! In severe cases of heart failure your doctor may recommend a reduced water and sodium intake to prevent stress on your heart, please see our Diet section for more information on sodium restriction. Once your doctor has prescribed a fluid limit (for example a common limit is 2 liters per day), you can use a container such as a water bottle  with the allotted limit and monitor your intake. Additionally any food with a high liquid content should also count as liquid, such as soups, ice cream, and jello. If someone has a low concentration of sodium in the blood, fluid restriction may be particularly important.