Muscle Nation Zero Sugar Energy Drink (Variety of Flavours) 500ml $2.25 (RRP $4.50) @ Coles

No sugar and only 20 calories with 160 Mg of caffeine

Also available in the following flavours:

Lemon Crush – Tastes like Solo in an energy drink
Raspberry Lemonade – Good first taste, strange aftertaste
Mango Passion – Tastes like Passiona

Ingredients:
Carbonated Water, Natural Sweetener (Erythritol), Natural Flavours, Acacia Gum, Food Acids (Malic Acid), Branched Chain Amino Acids (L-Leucine, L-Isoleucine, L-Valine), Flavour, Caffeine, Sweetener (Sucralose), Inositol, Vitamins (c, B3, B5, B6, B12), Natural Colour (Red Radish Extract, Purple Carrot Extract).