Never really observed how I opened a water bottle... but I think with my right hand twisting to the right, or something like that. I am right handed though.
It depends which hand I grab it with (usually left) and where I grab it. If I grab the top to lift it over stuff, I'll put it in my right hand and twist the cap and bottle simultaneously. If I grab the middle, it stays in my left.
>Grab water bottle >Right-handed master race checking in, so grab with right hand >Hold firmly, don't want that **** slippin >Grab cap with left hand >Squeeze bottle viciously with right hand >Water bottle explodes with awesome power >Catch falling water in mouth >mfw
I open a water bottle by taking my sword, cutting off the water bottle, letting the water spill over the floor, and licking it liquid off the ground and devouring the plastic like an animal.