what is the correct way of long time storing of bulk instant yeast?
I purchased a 450g/1pound pack of instant yeast, used a spoon once, then kept it in a tight-lid jar in the fridge 2 months ago. Now when I try baking with it, the dough doesn't rise, though its expiray date still has a year left. Is it dead? or can I still use it (I want to use it in no-knead pizza dough, should I double the yeast quantity?) what is the correct way of long time storing of instant yeast?