The reason I cast is the same reason I handload for my centerfire calibers. I like doing it. There's a real good side benefit as well. The more things I do and make for myself, the more difficult it is for my line of supply to be disrupted. For the last six months anything having to do with shooting sports has been either in very short supply or not available. I, personally, have been almost unaffected by this gap in the supply line. Things are trickling into dealer's inventories now, slowly, but they're showing up. I am resupplying as I can but I've pretty much quit using jacketed bullets and am casting up good quantities for my centerfires and for my muzzleloaders.
I'd recommend an electric pot, Lee has several that are very good and not at all expensive. The instruction sheet that comes in the box is very good. The convenience, and safety of an electric melter cannot be overstated.
MidwayUSA
http://www.midwayusa.com Midsouth Shooter's Supply
http://www.midsouthshooterssupply.com or Graf's
http://www.grafs.com usually have excellent prices and service.
Using a coleman stove and a frying pan will work, of course, but I always try to discourage that. Dedicated casting gear designed and made for melting and handling hot lead is always a better choice.
A question not often asked is what happens in the future if your cool old iron kettle or dutch oven you use for a casting pot or the cornstick or muffin pans that make such good ingots ends up back in the kitchen?
Would you like to have your grandkids eating food lovingly cooked in Grampa's old lead pot, you know, the one that looks exactly like a dutch oven?
I still have my original casting pot, made from a short piece of 4" exhaust tubing with a bottom welded into it and a ladle made of an old iron spoon, reshaped, cut short and driven into a piece of broomstick for a handle. I have an ooooold Coleman 502 stove for a heat source. A small, bright fire would do as well.
Your mileage, as always, may vary.
Three Hawks