Provisions, provisions, provisions! These are essential to your hiking supplies. Ask yourself how long you will be able to go without replenishing food or drink. Water is of utmost importance when planning an excursion. You will need about 3-4 liters a day. If you are not sure where or when you can replenish your water reserves, then the weight of the water alone will already add a serious load. Food will add another 1.5-2 pounds per day. In general it is unrealistic to go for longer than about a week to ten days without being able to replenish your provisions.