Candles are a form of light but can also be used for heat and cooking. Yes heat and cooking. Light: you can use basically any candle for this. Please note most "survival sites" recommend unscented candles or those expensive emergency candles. I have read that one can use the prayer candles that are nice because they are enclosed and long burning. You can find prayer candles in you local grocer or dollar tree. Prayer candles-http://Bulk St. Jude Glass Prayer candles, 8" at DollarTree.com Survival candles- Amazon.com : Coghlans 36 HOURS SURVIVAL CANDLE, 6 OZ : Camping First Aid And Safety Equipment : Sports & Outdoors I personally have a variety of candles. Since I burn candles daily I tend to have more scented then unscented but my stock is always rotating. You should rotate your candle supply, all of your supply, especially if you live in real hot conditions that the candles could melt or warp. Or if you live in a damp area, this can affect your candle. Cool dry storage is the best. I have been reading about soy candles that you can make. Since I am thrifty, these soy candles not only can be used for light but also moisturizer. Plus oils can be added to your soy candles when making so you have light, moisturizer and aroma- therapy. These are usually called soy massage candles- shea butter is also added, which is good stuff. Soy Massage Candle Recipes with essential oils | Naturally Organic Skin Care Since thrifty and dual purpose is something I strive for here is the recipe for how to make a Crisco candle. I am sure it has been posted before but this simple dual purpose item bears repeating. One question I do have regarding a Crisco candle is if you use rancid Crisco does it smell or is it bad? Also there are other items to make candles please chime in- did someone say chapstick? chapstick candle | Field & Stream Candles for Heat and cooking: For all you that live in cold areas please have a candle in your car for warmth in case you get stranded. Don't leave the candle in your car over the summer it will melt. I have jar or tin candles in our vehicles, safer and easier then wax dripping all over. If your power goes out you can be in a tent inside your home with a candle burning to keep from freezing. Please use safety rules at all time, don't sleep with the candle burning while sleeping. Hear is the youtube video for a clay pot heater & votive candles. I am sure this has been posted before but it is good to have it repeated, though there is debate about the effectiveness and environmental impact of this. Cooking with candles- it can be done big candle or tealights, all will work. Cooking With Three Candle Flames | Self-Sufficiency Please note there is a youtube video that shows a guy putting his tealights around his burner because his gas is out, personally I thing this is unsafe cause some people could forget to make sure their gas is off. Cook with candles safely.