How many pieces of adult diapers are appropriate to purchase one-time when Mild incontinence?

The daily water requirement of a normal adult is generally calculated based on body weight: daily water requirement (ml) = body weight (kg) x 40 (ml). For example, a 60kg elderly person with mild incontinence needs 60×40=2400 ml, that is 2.4 litres of water per day. Adult diapers generally have an effective absorption of 1000ml~1100ml in one piece, and 3 pieces can absorb about 3 liters of urine. Under this extreme condition, 3 pieces can effectively meet the one day needs of an incontinence elderly. So the elderly with mild incontinence can buy a pack for the first time. When buying again, according to the extent of their own urine leakage, they can buy several packs for reserve, because it is relatively thin, they can carry in the bag at any time, and to use at any time.