Cocktails Grapefruit Juice

How I can open this bottle??
I have 64 ounces (2 quarts) plastic bottle of grapefruit juice. The plastic lid is so hard, I've been turning until the hand is raw. I tried to use a knife but did not work. I wrapped a towel, but still has not worked. Any ideas? I want juice bad at this time (to make a cocktail). I bought a backup as you can: (I used to have such help @ rubber jar opener – I had writing an angry letter to a manufacturer and threatened to sue if the knife he was using his cousin cut my jar was so difficult to open, so I sent express a rubber starter when I moved I lost. I'll get a rubber band, I do not know if that can be big enough to work, I do not think I have clips, but that is a good idea – as a last resort, I'll cut a hole through the bottle with all my adrenaline build here:) there is no work: (hey I did, but I got injured hand. I think they need to make it easier to open for us grlz; 0
This is the way it did before all the rubber jar openers came out …….. Run the top of the container with hot water and then use a damp cloth to open!
Salty Chihuahua Grapefruit Cocktail