A good way of testing your bike/ run cocktail

I've been working on the perfect mixtures for my bike and run bottles however, I've been worried that I might be 10 miles into a 30 mile ride and my mixture of say prune juice and olive oil has some surprisingly adverse affect on my GI tract. What's a boy to do?

So, today I mixed up a batch of Cytomax and Red Bull which has been untested in my bike bottles and consumed it prior to mowing the yard. Yard work takes me roughly 2 hours and consuming my drink prior to hitting the heat and stress of mowing, edging and weed eating was a pretty good test. [I survived.] It's probably not a perfect test of a race day experience but a pretty good step in the right direction and better than finding out on a ride.

Oh, a question for the group:

1. What do you put in your bike bottles?
2. What do you put in your run bottles?

Does anyone really use the mixture of Cytomax, Carbopro, Metabolol Endurance and Red Bull on the bike?

Yours in alchemy,
Chap