What kind of gas do you want to use? I used an MSR Whisperlite for years, which can use pump gas, white, kerosene, or anything that burns. But you have to worry about the big gas bottle and the smell.
I've since used a JetBoil, since I mostly eat soup or MH meals. The gas is sealed and is a very efficient stove. I know there are others; but those are the ones i've used.
I've used the iodine purifying pills; but make sure to bring some Emergen-C or something to mask the taste. Otherwise look for a pump.
Do a search on the is section, and you'll find a few topics on it.
"...I'd rather be tried by twelve than carried by six..."