Buy a jug of white grape juice. Pour it out. Decant your favorite white - it is, still, grape juice, is it not?

Ditto red/purple grape juice.

Or ditto your favorite beverage made from the bounty of the land, be it hops, corn, barley, etc., imbided (embided?) from a lovely mug. Just make sure the original container is tucked away in your luggage somewhere well out of sight and that you then cart it (them) off the site instead of tossing them in the trash.