Use a pump style portable water supply to get water to your core drill or wet concrete saw without the need for a garden hose or electric source.
Stihl Water Tank - fill anywhere, pressurize and re-pressurize by manually pumping. Sometimes called a mobile cordless water supply.

The RH500C or Dewalt DCE6820 battery powered water tank is the perfect water supply when using a Concrete Core Drill or Concrete Saw. It is powered by a 20V DeWalt Battery and has a removable tank for easy filling. Also called a water tote, mobile water cube, cordless water supply, or a water container.