A plastic bottle, typically a Gatorade bottle, filled with said Gatorade or any other mixer and the alcohol available. Essentially empty enough of the original contents or pour enough to suite you and add the alcohol to the bottle, put the cap on and shake it. Very convenient and easy to hide/lie about.
We used to make Happy Bottles and bring them to school, be drunk by lunch.
The Urban Dictionary Mug
One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.
Buy the mug