Another classic trick that probably your parents and the parents of your parents also did back in their time. Swap out the contents of any water bottle with clear alcohol like gin, tequila, etc. Just make sure that no one around you gets thirsty enough to take a chug from your bottle.
This is a pretty cheesy way to hide your alcohol. The best part about mixing your drinks with Gatorade, Redbull, etc., is that they mask the bitter taste of hard liquor. How many adults know the taste of an energy drink? Even if someone does decide to take a chug of your 'energy drink,' there's almost no chance that they become suspicious of the contents of your bottle.
Lots of companies are now selling casual daily products with hidden flasks to store alcohol. Even some phone cases these days have an 8-ounce flask hidden under the camera. They don't even look conspicuous. You just need to make sure that you don't drink it in front of anyone. Holding the phone case up to your mouth is pretty suspicious if you ask me.
Shampoo bottles are like a teenager's safe haven when it comes to hiding alcohol. Even if your people do suspect alcohol, where are they most likely to check? Your closet, under your bed, or inside your shampoo bottle? It's a classic trick that works 90% of the time.