I'm afraid to ask how much Everclear you and your friend added to the grape juice!!!
BTW, almost one month for this thread.
It was a couple of pints of medicinal grain alcohol from the infirmary, which may be stronger than Everclear. I was in the Navy and attending a school at Lowery Air Force base in Denver and he was an Air Force medic with weekend duty, so he couldn’t leave the building. My girlfriend shared an apartment just off base with his girlfriend. We all met at an NCO club dance. I brought the two girls on base that evening to visit him. The only thing available for mix was two large cans of frozen Welches grape concentrate in the infirmary freezer. We didn’t add any water to the concentrate. It seemed like a good idea at the time.