If you plan to use dry yeast you should activate the culture first. As discussed previously, yeast needs to start in an aerobic environment first, so it can then readily adapt to the anaerobic conditions in our little fermentation factory. Many folks who omit this step believe they are creating this situation with just the action of pouring the mixture into their bottle. But they also do not realize that much of the yeast they use dies, because many of the yeast cells could not complete the aerobic phase of its life before the conditions change to anaerobic. This step insures all the yeast is already aerobically active and working before it is placed in the generator. The time it takes for the generator to begin producing pressurized CO2 is significantly reduced by this following step. These yeasts also need to be rehydrated properly, as also previously mentioned, so as to not damage the yeast cell walls.
I take my measure of yeast, add a small quantity of tepid water, 100º-115ºF, (not hot), and stir it up in a little cup with a fork. Stir the mixture until the yeast in no longer in clumps, but instead a smooth creamy tan liquid. Now here's the part everyone forgets, add a few pinches of sugar and vigorously mix the yeast liquid up making lots of bubbles. You want to get oxygen in there to get the yeast going. Once this is done, let the mixture stand for about ten minutes. Then take your funnel in hand, open the aseptic bottle you prepared, and pour in your yeast culture.
dont ask me how, go find out yourself and its probley illegal where you live 
