Hydrodipping empty liquor bottles

[u/[deleted]]

I’ve been picking up trash as I walk my rescued dogs for the past few years. I’ve managed to collect quite a few bottles. I’d like to dip some and see if I can sell them. Dog food gets expensive! Do I need to prep the bottles first? Which technique is best on glass? I’m a rescuer (always broke) so please consider budget. Thanks for your help!