First, how bigs your water tank? There's a few DIY options. All will require drilling the tank and some craftsmanship. One is a solar heater, black hose in a glass covered box (thermo siphon), another is propane burner with a coil, solar airerator, wind powered water pump, wood burner heat exchanger, the list goes on............... Wheres your water trough? Simply putting it exposed to the southern sun and a flat black paint job will help. Just a few ideas, I know they are vague but it be a book if I typed it here.
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