Take your pick (straight from the Fermentis site):
Rehydrate using either sterile water or wort at a ratio of 10 times the weight of yeast to be used. Mix gently to form a cream and allow to stand for 15-30 minutes. Then mix vigorously and stand for a further 30 minutes prior to pitching into the wort. The temperature of re-hydration is important (27C ± 3C for Safbrew and Safale, 23C ± 3C for Saflager).
An alternative method is to sprinkle dry yeast direct into the wort and allow to stand for 30 minutes before mixing to distribute and aerate the wort.
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