Step 3: Mix the drinks
Yellow & green drinks:
Crush up a B100 complex vitamin. One pill is good for many drinks as you will only need a tiny pinch of powder to make the liquid glow.
Add some powder to the bottom of your glass and pour in the desired drink. Red Bull or similar energy drinks are a great choice as they already contain a small amount of riboflavin. The vitamin powder has a bit of a medicine taste to it, so strong flavoured drinks are better at masking the bitter taste.
To make the drink green, add a drop of food colouring and stir.
In addition to the classic gin and tonic, try adding tonic water to other mixed drinks. Tonic water has a bitter taste, so I found that sweet mixes worked better.