How to build a cave-man fridge
1. You need to find some snow outside in summer. Good luck!
2. Carry it over in sufficient abundance to the place where you've decided to laze around(may require more than one trip)
3. Place warm beverages in a small pile
4. cover with supply of snow
5. Wait (climb fire tower)
6. Come-back. Remove chilled beverage from pile. Drink and be merry!