Is the bottle you are trying to open extremely tight and impossible to open?
I've just discovered the easiest way to open an extremely tight plastic bottle cap yesterday !
You only need a rubber band !
If the surface you are placing the bottle on is slippery, it's good to place wet towel under the plastic bottle.
Then, tie a rubber band two or three times around the cap of the plastic bottle.
and twist the cap.
It will open immediately.
I was really impressed to know this way, because nothing really worked and my hands got very hurt by twisting it hardly.
When I sometimes put a plastic bottle of water in the refrigerator without opening the cap, the cap got very tight and it was hard to open it.
But since I found this way, I no longer have to worry about it.
If this way is new for you, you may want to try it.
For opening a tight glass bottle lid, it usually works by hitting the edge of the lid with metal spoon.
I really wonder, why ?
but it usually works.