A clean, fast, and convenient way to prepare and use SIS drinks. This bottle is specially made for SiS, with handy markings that are a key part of the easy-mix system. To use, start by adding drink powder up to the appropriate level, as marked on the bottle; then part fill with water and shake to mix the drink. Finally top up to the final level with more water. The result is no fuss, no mess, and less chance of contaminating your drink - assuming that you keep your bottle clean!