getting lots of brand champagne for fast leveling and money

[Nite69]

At the very end of the supermarket thier is 5 coolers, the game will make a checkpoint at this point. Just keep reloading your checkpoint and you can stock up on champagne without having to worry about enemys, You can get between 1 to 4 bottles on each reload.

Then just take them all all to the booze mission at the resort map and get 1000 XP and $991 diamond per bottle.