All of the above work well. Petroleum jelly in a small squeeze tube is useful for a variety of things besides starting fires, but smearing some on your tinder really helps make a good fire quickly. It's safe, cheap, and readily available, too. One of the best and most easily obtained accelerants is cigarette lighter fluid, also known as "boy scout juice." The Ronsonol Lighter Fuel I'm looking at now comes in a 5 oz. yellow plastic bottle with a flip-up spout that seals pretty well. It's not totally leak proof, but it comes close. It has a good shelf life and doesn't cost much. I buy mine at the grocery store. WARNING: This stuff is naphtha, which is a strong irritant if you get some on your skin and don't wash it off fairly soon. If you overfill a good old Zippo lighter and it seeps out in your pants pocket you will have a chemical burn in a couple of hours. Been there, done that. And, no, I have never smoked.