When made this way there are no open flames around the thrower. You will need sulfuric acid and potassium chlorate. both of these chemical are relatively safe to handle, simple to obtain, and reliable.
Fill your bottle with a half-inch of concentrated sulfuric acid and top off with a 4:1 mixture of gasoline and oil and cap it tightly. Next you will need to prepare a saturated solution of potassium chlorate and soak a sheet of paper in it and allow the paper to dry.
Once dry securely attach the paper around the outside of the bottle with glue, tape, or a rubber band. Once you are ready to use the cocktail shake very well to mix the sulfuric acid throughout the mixture as droplets, and then throw. When the bottle hits and breaks,some of the droplets of acid will come into contact with the paper which saturated with potassium chlorate and ignite itself along with the gasoline and oil.
This is the method used by the Soviets against the Nazis at the battle of Kursk. By using these self igniting cocktails they avoided the need to attempt to light one in the heat of the largest tank battle in history.
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On a side note the account of Kursk I was reading was on a .edu site. Funny how and educational account of history was purposely vague about the third component.
Pure alcohol (used as paint solvent), with a very small quantity of hydrochloric acid, will slowly dissolve tin (the element, do not use aluminum foil). The alcholol (such as ethanol) must be at least 90% pure. The tin was once very common several decades ago, but is now hard to find. If enough tin is dissolved in solution, such solutions can spontaneously ignite if left exposed to air.
Both chemicals are very easy to obtain and have multiple methods. They could be made into separate guides though.
KClO3: Extract it from matches, ion swapping with bleach, electrolysis with bleach, or just purchase it online.
H2SO4: Professional strength drain opener at plumbing/hardware stores, boil battery acid, electrolysis with a solution of root killer, or again, purchase it online.
^^ to the heating the gas for napalm, no need to heat it, if you just use styrofoam (cooler kind or plates) will work just fine, if you press down own the styrofoam it'll dissolve faster (fumes'll give you a headache if you do it inside) and it'll leave a hard black plastic like reside on what ever its burning on
That is a great idea!