A frig is nice, but coolers can make do...just requires a bit more work and thoughtfulness for keeping perishables properly chilled. I have two Coleman Extremes...5-6 day coolers. One I keep my perishables in (lunch meats, bread, mayo, veggies, romaine, etc)...I only open it twice a day at most, and then quickly. I don't bring many perishables in the first place, so eggs and steaks, etc. stay home. This one gets a 10# block of ice. I probably replace it twice with purchases at Arctica.
The other one contains my beverages...beer, juices, sodas, fruit cups... because I like them super cold. I buy my milk in small individual steripaks that don't require refrigeration, toss one in this cooler to chill it before pouring it in my cereal in the morning. This one gets an 8# bag of crushed ice. I use some of the crushed ice for my CamelBak so I have chilled water while touring the playa. I'm in and out of this one a lot. That plus crushed ice melts faster requires 3 or so replacements.
With some care, melt-water can be used for drinking/washing. Keep your cooler off the ground and in the shade. If they're in the RV they'll take up floor or seating space, but it's doable.
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