Do remember that cans used for food are lined with a plastic substance to keep the food from corroding the can. Unfortunately, this lining often contains BPA. I personally wouldn't use a pot made of a can for that reason.

If you need a cheap pot, the KMart Grease Pot (found with kitchen accessories, not sporting goods) is lightweight and works just fine. It's also available at amazon. Unfortunately inflation has reared its ugly head since I bought mine in 2005 for $5.00, but it's still a bargain. Just toss the strainer in the recycling bin, replace the knob on the lid with a piece of thin wire or duct tape, and you're good to go.