its very possible gatorade bottles aren't sealing tight enough. its not a carbonated beverage, so it just needs to hold a negative seal until first opened.
I bet the could be sealed if you really wrenched down on the cap, more than just 'snug' by hand.
Primary: English Mild
On tap: Pale Ale, Lancelot's Wheat, English Brown Ale, Steam Beer, HoovNuts IPA
Bottled: MOAM, Braggot, Raspberry Melomel, Merlot, Apfelwein, Pyment, Sweet mead, Cabernet
Gal in 2009: 27, Gal in 2010: 34, Gal in 2011: 13, Gal in 2012: 10