A clean fast and convenient way to prepare and use sis drinksthis bottle is specially made for sis with handy markings that are a key part of the easy mix systemto 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 waterthe result is no fuss no mess and less chance of contaminating your drink assuming that you keep your bottle cleanan extra wide opening m