hiya bikeaway...
are you road biking or mtn biking? On a road bike here's how I learned to get my water bottle while riding without crashing and killing myself...
place your left hand towards the CENTER of your handle bars and remove your right hand... sit up some and ride one handed... do not reach for the bottle, just get used to the feel of one handed riding...
next (after doing this several times) do the same thing but this time reach with your right hand (left hand is in center bar steering) down to your downtube where the cages are... slide hand down to water bottle and gently pull it out...
OK... so now ya gotta get it back in... left hand centered, steering, glance down and look at bottle cage... then place bottle at top of it and push downward to slide it back in... if you drop the bottle LET IT GO! THEN stop and go back and get it... do not try to wildly reach for it... LOL... learned THAT lesson! Do this several times on a straghtaway for practice... after a while, like anything else, it becomes second nature...
It is extremely helpful to be able to drink while riding without having to stop...
There is a fine line between "hobby" and "mental illness".