For this sort of usage, I would recommend a Trangia stove. They are fairly cheap (around $11 or so), reasonably light (3 oz unfilled), and very sturdy (brass construction). They can also carry their own fuel supply - enough for about two boils or so. Just be sure the o-ring in the cap is intact.

I carried one of these in my SAR kit for years. They are perfect when you want something reliable and rugged that will boil water with little or no attention or fussing. Used with a basic windscreen and lid, they will boil about two cups of water in four or five minutes.

One is tucked away in my car even now.