Thank you so much everyone! I found a good deal on a pressurized system, and picked it up today, so hopefully that will be that.
Once I get that going, I might try diy on my 10 gallon, and will still need these tips.
I used aquarium silicone sealer to make attach the hose to the bottles, and used some hard tubing instead of putting the soft tubing in the holes. I also used shorter peices of tubing on the bottles, so I could just attach that to the coupler/splitter, so that I wouldn't be messing with the seal on the caps.
It could be a leak... maybe I will start from scratch next time. It isn't as if 2 litter bottles are expensive.
Speaking of which, could I just use a 1 litter bottle for my 10 gallon, to save on space?
I haven't tried making syrup, but I did mix the sugar with hot water first to disolve it (then added some cold water before adding the yeast so i wouldn't kill it.) I didn't pre start the yeast though. You don't really have to in bread, so i figured you don't have to in diy co2 (and most recipes don't call for it) but it certainly won't hurt to try.
Zareth, when you say you seal the bottle with teflon tape, do you just seal where the hose goes into the cap, or do you seal up the whole cap when it is on and re-do it when you re do the mix?