Making gel food is not really an exact science. But I can give you my recipe I used, and you can make appropriate adjustments as you see fit. This will make more gelfood than you need for the medication, but you can put the extra in a cookie sheet, in the fridge, then in the freezer to use at another time. All of my fish eat it, other than the stubborn bichir. Cut it into squares after it's "set" in the fridge, and lay it on the cookie sheet or some other flat surface so the pieces are not touching. Use saran wrap in between the layers, so when they freeze, they won't stick together and you can pull them apart.
You will need a scale that can measure mgs and also grams. The dosage for the Fenbendazole is x mgs of medicine = x grams of food. i.e. 100mgs Fen = 100grams of gelfood
What you will need for gel food is these ingredients:
*one can of sardines (in water)
*one can of mackerel (in water)
*one can of oysters (mine came in cottonseed oil, you can use it too, but drain all of the oil away, no need to rinse)
*one bunch of kale (type of leafy green in produce section)
*one half zucchini (you can freeze the other half for another batch of gelfood)
*one clove of garlic (if the clove is rather large, use half of one clove)
*three packages of plain, unflavored gelatin (the brand I buy is Knox, and comes in packs of four, if you find another type of gelatin that does not come in small packs, use three teaspoons of the gelatin powder)
*one men's daily multivitamin ground into fine powder
*one acidophilis(spelling?) tablet also ground into a fine powder(it's a probiotic sold in the vitamin section, also called Lactobacilis)
You will also need a mortar and pestle. (bowl and grinder thing that old school pharmacists use, I got mine at an herb shop) I use it any time I make gelfood, so it was worth the expense for me. You can make regular gelfood to feed your fish on a regular basis, if you want, it's more nutritious than pellets.
Depending on the type of fish you have dictates how much vegetable matter you put in the food. If you have predators, then you only use a small amount of vegetables. I feed my tropical fish gelfood with 2 parts fish, one part vegetables.
Anyway, after you have all of your pills crushed, you blend everything together until it's like a paste/thick liquid. You put about half cup of water in a small sauce pan, and heat the gelatin while stirring. Don't let it quite come to a boil, that will make it lumpy, but you want it hot enough to "steam" a little. You add and incorporate the gelatin mixture into your gelfood stuffs. Make sure you get it evenly distributed so it will set correctly in the fridge (or else you will get some harder parts, and some soft parts that fall apart in the water.)
Again:The dosage for the Fenbendazole is x mgs of medicine = x grams of food. i.e. 100mgs Fen = 100grams of gelfood
You will feed this food 2x per day for three days in a row (I know I said 1time per day, that was a mistake, Mods can you please edit it, if you have the ability?)
I used an ice cube tray, spooned the mixture into the ice cube tray, let it set in the fridge for a few hours, then in the freezer overnight. Once it's completely frozen, you can pop out the cubes, store them in a baggy in the freezer for future use. Thaw out one cube for use, cutting it into bite size pieces for each fish. Make sure there is enough for every fish to eat.
I'll also post later on how much fenbendazole to add to the tank per gallon, I just don't remember right now.