I worked in the construction industry for 20-odd years, and it is absolutely normal for field offices put on sites in areas far from existing utilities to have 500-gallon potable water tanks, multiple 100 lb propane tanks, equipped with showers, running water, air conditioning and refrigerators, with the generators and water heaters powered by the propane. You HAVE to take care of the basic human needs of people far from normal services, and such units are mass-manufactured. Surely the government owns a few of those. I'll bet FEMA field offices for disaster recovery have these amenities.

These people are NOT going to the festival for fun. These are not stupid requests.