No power or water at my backyard barn. I use a Honda generator, an electric kettle, and an immersion bucket heater. Or, I lug hot water from the house in 1 gallon milk jugs, or 5 gallon containers. I use this water – no mater how I get it – to top off water buckets & bring their stock tank temp up as high as I can. Occasionally, I need it for first aid or washing small areas of horse. And I make myself tea, of course!
Kettles are small – make 1.5 liters hot in a few minutes. Bucket immersion heaters are dangerous when ignored/forgotten about, and take awhile to heat 5 gallons . . . but, I’m mucking out at the time, and really, I’m just looking to delay freezing, so I don’t care how hot things get. I just take whatever results and mix it into the 5 gallon water buckets. Which are insulated with either the SmartPak cozies, or sit in insulated hard plastic holders (like heated buckets w/o power). It works surprisingly well – between my efforts, and horse body-heat, the buckets stay clear many nights. Worst case scenario is 1/2" of ice, which none of my herd has trouble clearing . . . and that’s just for a few hours until their bucket-heating servant returns. When you don’t have hot water on demand (or power) it’s all about consistently chasing the ice away 