This is a recipe I got from Coolrunning website and it works well.

You need:
Polyjoule or Polycose Powder (AKA Maltodextrin)
Gastrolyte sachets
Cordial


Mix 1.5 cups of polyjoule, I sachet of gastrolyte and a generous amount of cordial ( about 1/2 to 1 cup ) to turn the powder into a gel.

Mix the ingredients for a minute or two. Depending on the consistency, add a small amout of water to get a runnier gel.

Refridgerate overnight- it will become clearer.

This makes about 6 shots, usually enough for about 4 hours bike/run.

Drink plenty of water (NOT GATORADE- it will give you malabsorbsion and the trots) with each shot.


Another recipe I have but haven't tried is :

I scoop of sports drink
6 scoops of polyjoule (=1/2 cup)
enough water to mix to gel

This makes 3 gels
wash down with 200mls water per gel

I like making my own. It is convenient and satisfying and cheap!