That sounds like a plan.
Keep in mind that even though #7 plastic is used in the US for water storage containers, they are banned in other countries and Nalgene has pulled their water bottles off the market if they contain #7 plastic. Actually, the problem is BPA, a substance in the plastic. Also, all baby bottles, etc that contain #7 plastic have been removed from the shelves. To some, it's not an issue, so I'm just telling you why I wouldn't do it. Also, while water may not have absorbed those chemicals, I'm not well enough versed in chemistry to know if a liquid with alcohol in it would absorb more or less of the chemical BPA or other chemicals.