I've used this method probably 10-15 times with varying results (i think the quality of the coke was a major factor) but maybe someone has a better method.
I usually get a gram or something first. Then these are my tools/ingredients:
metal spoon
metal butter knife
baking soda
bottled water
metal sewing needle
lighter
key or end of straw to place bumps of coke on the spoon
paper towel (for mess...)
First I put 2-3 'bumps' with my key/straw on the spoon, then I sprinkle a little baking soda (maybe 1/5 to 1/4 compared to the blow)
then, I dip my finger in the water bottle and put 3 drops on the spoon so it covers all the coke/bakingsoda but doesn't drown it completely.
then, I stir it up a bit with the metal sewing needle
next, I use my lighter (bic usually) and heat the spoon without letting the flame actually touch the spoon
the solution bubbles a bit, the water evaporates, and I'm left with an oily goo that I scrape with the metal butter knife.
repeat a couple or several times always using the same knife to collect the oily substance
let it dry on the knife for a little, then gently scrape/push off onto my homemade pipe (water bottle usually)
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any suggestions for improving the method? (without having to buy any other ingredients/tools)
Also, I usually just use a regular water bottle with 2 holes poked in it. I put a cut straw in one hole and tape it so there are no spots for air to escape while the other hole acts as a carb. I also fill the bottle with a little water. I place the crack on a piece of foil with ash from a cig and little holes poked with the sewing needle. Light it up, and enjoy ..
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I have pretty good coke. My new guy has much better stuff than I used to get, but this batch is cut with something that is irritating my nose and making it drip alot so I figured I would try making some crack with it to give my nose a break. The coke is good, its just cut with something my nose doesn't like. It's not the best (I've had almost pure straight from Colombia when I was in Panama) but it is pretty good.