Markus,

BABY STEPS!!

I found that the Camelback was a nuisance and I actually found that after a few outings all I needed was my water bottle(s) on my bike just like always. It also helped me a lot if I didn't talk while riding. Breathing thru my mouth didn't matter either. After a few times I was back to really normal hydration needs and remember a little squirt goes a long way to counter the dry mouth so if I were you before I spend $50 + for a Camelback I would just carry a 16oz water bottle filled with half and half water and OJ, a cheap man's efficient energy drink.

Remember baby steps while getting back into shape. Start off with a week of walking increasing with longer distances and faster pace. Then a week of fast pace walking mixed with jogging periods and increasing distance. Next week jogging with increasing distance and periods of sprints, etc. The weekly periods I mentioned may have to be increased to 2 weeks depending upon how out of shape you are and it doesn't take long to get out of shape. You need to SLOWLY increase your aerobic capacity and SLOWLY condition your muscles. If you over do it now it can set you back for weeks both mentally and physically. I was a Certified Aerobics Instructor and taught aerobics for years and years at places like Bally's. I would still like to teach but I just can't find the time plus they would probably want to teach that seniors water class for insurance purposes...over my 60 yr old body!