I'm hoping someone out there can help me. My brother (whose account I'm using) was a huge fan of this forum and pizza-making in general. He made at least 5 pizzas per week for my family and friends. He had all the pizza-making tools and supplies and continually practiced to perfect his pizza. Unfortunately he passed away suddenly and unexpectedly last month. At my parents' house he left 2 containers of flour and a big jar of some unidentified white thick liquidy stuff, that I'm guessing is yeast and water mixed together. I would like to replicate his pizza (he left me his recipe), but I really don't know what this stuff in the jar is and how to begin. The stuff in the jar has been put in the refrigerator since he died. Is it still good to use? How much do I use for about 3 cups of flour? I can't find any IDY (which is what he preferred over ADY) so I'm assuming this is it. I appreciate any help you can give.