I've been using a form of homemade sports gel, and it's been really successful - and I have a circle of friends that are way into it!
I read the ingredient of a few popular gel products, and I thought - geesh, this stuff is simple!
Here's my recipe:
1. Brown Rice Syrup (easily available at health food stores) --- [carbs]
2. Protein Powder (vanilla seems to work best) --- [protein]
3. Cashew Butter --- [fat]
4. Electro-MIX by Emergen-C --- [electrolytes]
I make this stuff in bulk, and I never measure anything, so bear with me.
a) Start with a blender, a full blender load will be our volume.
b) The brown rice syrup will be too thick to mix in a blender. Warm the stuff up for about 15 minutes by putting the jars into tub of hot water. Avoid a microwave, which will work fine, but may create "bad vibes." The syrup needs to be thin enough so you don't burn out the blender's motor.
c) Pour a bunch of syrup into the blender, have some hot water ready for adding to the syrup, a little is all thats needed to thin it out.
d) Add a heaping spoonful of cashew butter.
e) Add a few scoops of protein powder.
f) Add a few packets of Electro-MIX.
g) Taste it, if there is too much protein powder, it'll taste chalky - just add some more syrup.
I store it in old Gatorade bottles in the fridge.
I use a funnel and fill up the gel flasks. I found 'em at a local sports store - but they are easy to get on the web:
I use this GOO while backcountry skiing, this is where it's really successful for me. I get a good boost on those long uphill skin tracks!