There are 2 types of water needed for running an intensifier pump. Cooling water and cutting water. This is explained later in these questions. If you have a limited amount of water available we would encourage you to consider a Deionization Unit customized for waterjet cutting to set-up a closed loop system. By reusing the water needed to cool your pump as well as the water used for the cutting head, you could reduce your water usage to only the water that evaporates.