SF anchorages: Richardson Bay in Sausalito - reversing currents and can be windy, there is a dinghy dock near some stores, not particularly secure as far as I know; Aquatic Park - NPS, same dinghy deal; Clipper Cove - great secure place, flat water, no real shopping. That's pretty much it. None really suitable to leave the boat for a week. Any SF guide book will tell you that, and will explain that marinas are the only place to go if you need supplies. The guides will also explain where the marinas are and local shopping from them. Availability may be limited somewhat by the AC in September, especially along the City, but the estuary always has spots, plenty in our marina and Marina Village which is close to a small shopping center (walking distance).
Have a safe journey.