I am a chef and here is the deal on yeast....The only thing that can kill yeast is heat so be careful how hot the water is when you put the yeast in, a little warmer than the skin on your wrist, kind of like a babies bottle. You can make yeast dough, form buns or loaves and freeze them, them take them out at night and let them rise on the counter and bake them in the morning. I also buy the 1 lb. packages of yeast at Costco, but some in a jar to use and keep that one in the fridge and the rest goes in to the freezer, in a container that is airtight. Try not to rush the rising process, the flavour of baked goods is improved with a long slow rise, My bread sometimes sits on the counter all afternoon and I just keep punching down until I am ready to deal with it. I always had a problem with yeast baking until I learned to relax and learn it's really not that difficult. :0)