Immediately cover your opened, leftover beer and stick it in your fridge. For growlers and regular 12-ounce bottles, I recommend using a rubber, pressurized stopper. This will minimize the loss of carbonation in the beer and will do the best job at preserving it.

What do you do with leftover open beer?

1. Fix Brown Spots on Your Lawn. …
2. Remove Coffee Stains. …
3. Polish Wood. …
4. Shine Copper or Gold. …
5. Fertilize Houseplants. …
6. Shampoo Your Hair. …
7. Trap Pests.

What can you do with unwanted beer?

1. Remove stains. Next time you spill coffee on the rug during a groggy Monday morning, reach for some stale beer leftover from your Sunday Funday. …
2. Restore wood. …
3. Add shine to hair. …
4. Ward off bugs.