You need methanol and oil. Methanol can be purchased at "speed" shops (go-kart, boats, dirt bikes, etc.) Oil must be compatible with methanol, so usually must be ordered on-line. I get mine from Morgan fuels. two gallons at a time. You can also use castor oil. But if you go to a store thay sells oil (such as motorcycle shop, lawn mower shop, etc.) it is unlikely that they sell oil that will work with methanol. At least that's what I have discovered here (St. Louis).

You can also add a few drops of food coloring to mek it easier to see. And I add a drop of armor-all as an anti-foam agent. Usual mix is 80% methanol and 20% oil. For the large displacement engines you have you can to to 85% methanol and 15% oil.