...or you could just grab a bottle of coke at the gift shop and put it in your pocket and walk out.
And if you do, then don't worry because Disney will allow you to ... even if you also stuck a hoodie and a DVD in a shopping bag too.
Shoplifting is apparently just fine with Disney ...but let's all talk about people reusing refillable mugs ... oh wait, @The Mom wisely closed that thread.
Oh, and if you don't shoplifting is a constant at WDW's parks then you haven't paid attention.