In many cases, you can. These things help: 1  Eat a well-balanced diet with plenty of fiber. 2  Good sources of fiber are fruits, vegetables, legumes, and whole-grain bread and cereal (especially bran). 3  Drink 1 1/2 to 2 quarts of water and other fluids a day (unless your doctor has you on a fluid-restricted diet).n many cases, you can. These things help: 1  Eat a well-balanced diet with plenty of fiber. 2  Good sources of fiber are fruits, vegetables, legumes, and whole-grain bread and cereal (especially bran). 3  Drink 1 1/2 to 2 quarts of water and other fluids a day (unless your doctor has you on a fluid-restricted diet).