I keep my campden tabs in a ziploc baggie with the rest of my brew consumables, more or less a cool, dry place. Otherwise known as a 5 gallon bucket in the spare bedroom.
Drinking Fat Tire Clone
Carbing/Aging Westy 12(new world), Chocolate stout V2, Pumpkin Ale V2.5 (1st batch 2014)
In the bucket Pumpkin Ale V2.5 (2nd batch 2014), Kinda Double Bastard
On Deck The Kaiser, Blue Moon, oatmeal porter