Watermellons... grapefruit... or squrriels . Or... you could buy the powder stuff and do it the right way. The powder is mixed 10 percent by weight in warm... but not boiling water until dissolved... and then poured into moulds and chilled in a
large refrigerator. (or you can pack ice bags around the mold). I like to use a 50 cal ammo can for my mold. It seems to be the perfect size. If you want somthing larger you could always use a 40mm MK-19 ammo can.
You will also need Thymol or cinnamon oil as a clarifier, which is added in the proportion of 1 drop per liter. You will also need heavy duty electric stirrers or an industrial mixer (or a hand with a glove)... a non stick spray... such as Pam cooking spray for releasing the castings, LD plastic film or Saran wrap for wrapping the blocks, a freezer for storage if you will not use the blocks within a week, and coolers to transport them to the range.
To do this right, establish the tare weight of a 5 gallon stainless steel container in which you will heat the water and mix the gelatin. Ideally this should have a spigot on the bottom to aid decanting the dissolved gelatin into the moulds. Add 12 liters of water to the container and bring the temperature to 65 degs. C and adjust the weight by adding or deleting water to obtain 12,000 grams. Place two electric stirrers into the hot water, one near the top and the other near the bottom of the container. Add three grams of Thymol or 12 drops of cinnamon oil and stir until dissolved in the hot water. Add 1500 grams of Pharmagel A to the hot water, breaking up any lumps with a stainless steel rod or paddle, to supplement the stirrers as necessary.
After the gelatin is dissolved, in 10-15 minutes, turn off the stirrers and remove them from the solution. Allow the bubbles and foam to rise to the surface for 20 minutes. If the container used does not have a spigot at the bottom, it is necessary to skim the foam off the surface before transferring the solution to the moulds. Allow the warm gelatin to stand at room temperature for at least one hour after transferring, so additional foam which rises to the top may be removed.
Place the gelatin in a refrigerator overnight at 0-5 degs. C. The gelatin may then be removed from the moulds by placing the container in hot water. After 15-20 seconds use a spatula to loosen the gelatin from the sides of the container. After two minutes remove the mould from the hot water and invert it over a piece of plastic film spread on a flat surface.
Once the gelatin is removed from the mould it should be allowed to remain at room temperature for one hour, then tightly sealed in plastic film and the wrapped block inserted into a plastic bag, which is again sealed to prevent evaporation, which drastically changes the consistency of the gelatin. Once tightly wrapped, the blocks can be stored up to six months in a freezer, or up to one week in a refrigerator. Unused blocks should be frozen immediately to retard mold growth. Before firing the blocks must be allowed to thaw and stabilized overnight to about 70 degrees F.
Oh yea i just remembered what i did when i was a kid and wanted to have some gelatin... i used pottery clay. The cheap crap they sell at those hippie stores. Just make sure its very moist all the way through... keep it in a cool moist place (basement if you have one) untill you feel like destroying it. The clay is real cheap compared to the gelatin... its like 5 bucks for a one foot long by 6 inch tall by 6 inch wide slab of clay. Just make sure you get the softest kind they have. (poke it with your finger and make sure it feels like flesh)