bit strange to arrange a tournament in a place with no taps and no shops, but ok;

“On average, a professional water delivery service will charge anywhere from $175 to $380 per truckload., and the average truck will hold 6,000 gallons.” - https://www.howmuchisit.org/pool-water-delivery-cost/

Could buy a lot of those for the price of an SUV, especially sharing the price between all the people.

Inb4 the tournament is held on a remote mountain top inaccessible to tankers and hatchbacks alike and only accessible to 4x4s so there’s literally no other choice.