Step 9: Desired improvements
2. I've added a three-way wye valve that will allow me to switch between two bottles with a twist of a knob while pedalling hard. I'm using this most excellent nalgene stopcock but it's very expensive. Anyone know of a similar food-safe product at a more reasonable price?
3. Make it easier to pour powders and squirt gels into the bottles . . . the small opening compared to ordinary bike water bottles is a disadvantage.
4. Find cheap replacements or less expensive sources for the pricier components.