Many years ago before water bottles were invented, guys in the stamping plant I worked for would would inject vodka into oranges then bring them into the plant for consumption while they worked.
I remember back in my younger days, we would simply get a 7-11 "Big Gulp" cup of ice water with several straws, dump out the water, fill with our illegal beverage of choice and it would last all day at the beach, the fair, whatever. Never got checked by the police once.
Clear alcohol in a water bottle??
Sounds like a much better idea to me.