Opening a 2 quart plastic bottle

One of my challenges, I had to compensate to do it.  I'm buying 2 quart V8 or tomato juice bottles to have something to drink around the house instead of soda. Lycopene you know. They have these indentations in the side to easily hold(hah) and pour it. I'm trying to just open the cap. I tried and tried to get my left hand open enough to grab the bottle that way - failed. I need at least three other hands, one to hold the thumb open, one to open the other four fingers and the last to hold the bottle upright.  The other possibility - hold the bottle with the right hand and grab and twist the cap open with the left hand didn't work either. My left hand can't close tight enough to grab something that small. Finally took a knife and ran it around the cap, separating the cap from the ring. Then it was to the Tommye K. Mayer method of using your hip as a support. I braced the bottle against the countertop and used my hip to hold it in place, using my right hand to unscrew the top. This is a delicate operation since you have to determine the stiffness of the plastic bottle so you don't spray the juice all over as the top is removed.  Or I could just get a large vise-grip and straddle the bottle with my feet. The cap is too big to grab with my teeth. I hate having to compensate.