Originally Posted by Mark Halliday
Rather than ice blocks, freeze 1 or 2 2lt bottles of water and stick them in the cool box.
Then you have cold food/drinks and ice cold water to drink as it melts.
I use Mark's procedure all the time. Works very, very good. However only fill the bottles 3/4 full before freezing to allow for expansion. The best thing is that it is FREE. I actually use 1 lt Sweppes(sp) Tonic bottle as they have a very good seal on the cap. Guess what my favorite tipple is? If you want longer cooling time then place a layer of dry ice on bottom of chest and cover with a towel. Warning: make sure the chest can vent,the CO2 from the dry ice otherwise you have a small bomb. I have lived on a boat for a week ( 2 people) with refrigerated food and drinks at temperatures approx. 90 F. using this method. No need to mess around with chests that whack your battery. Also, plan ahead, do not put un-refridgerated items in chest. Cool or freeze items the night before in Fridge.
Tips from a guy who boats and camps out in a VERY warm climate. Today the forecast is 115 F.