I have a waeco compressor fridge in my vw camper, and, yes they are bloody expensive, BUT, they are awesome, and use no power whatsoever. And yes, before anyone says, I know that I cant take it to the beach
I switch the fridge on, half setting, and within 10 -15 minutes, it is down to temperature. We use it all the time, on simple days out, for keeping the packed lunch / picnic cool, to using it for weeks whilst camping.
For the beach, though, we have one of these, and can highly recommend them, also really good on the boat...!
Coleman - Xtreme® Coolers
I have the 70qt one, and it is massive, but the smaller ones are superb. What we tend to do, is use the food recycling caddy, obviously after washing it out
, fill it with water and put in freezer. When frozen, place in cooler, and it will keep your food and cider cold for days on end. Or for speed and ease, buy 2 bags of ice from Tesco, and put in......!