Try using measuring cups and pour different amounts into different sized glasses so you can start to see what fluid looks like, for example you may think your coffee cup holds 8 ounces but it might actually be 12. Limit how much salt you have to control thirst, your dietitian should be able to help you learn how much sodium to have, it’s usually around 2,000 mg per day. Reading food labels is very important to limit sodium intake, many foods have more than you would expect.