Actually, if you forget your favorite liquid refreshment, you may have to drive to Bowling Green anyway. The area around the caves is in a dry county, and Bowling Green is the closest city to buy liquor. While vacationing in the caves area, I remember a few trips to Bowling Green.
The caves area is great. You can spend a good week there. Have fun.
Hardin County (Elizabethtown) is now a wet county. It is not that far from Mammouth Cave either.