Here's a blurb from my website (I own townhomes in Windsor Hills Resort)...
The link to US192 lists ALL of the stores / restaurants by location up and down the "strip"...
Where can I pick up any extra sundry items I need?
Our home is located just minutes from US 192 where numerous supermarkets and superstores are found. There is a Publix supermarket located 2 miles West of Old Lake Wilson Road on highway 192 and a Winn-Dixie at Formosa Gardens Plaza, just West of Old Lake Wilson Road on highway 192. There are also 3 Wal-Marts and a Super Target within a short driving distance, well as numerous convenience stores located on US 192. Also nearby are stores such as Walgreen's (drug store), and many others, so obtaining nearly anything you should need while vacationing should be quite easy, and a whole lot less expensive than staying on the Disney properties and eating out all the time with no kitchen!
Here is a map of US-192 and all the stores / restaurants / etc on it:
http://www.kissimmee-us192.com/map/ushwy192mapindex.htm
Windsor Hills is on section 2, the "shortcut" road to WDW is on this map also, Sherberth.
Here's another great idea...don't feel like spending time at the grocery store when you arrive? Pre-order it all and have it delivered right to your vacation home from
http://www.gardengrocer.com/ !! This company is like what we call "Peapod" here in Chicago. You can pre-order all of your groceries online and have them delivered anywhere in the Disney Resort area whenever you would like!! The groceries cost the same as going to the store yourself, and are of high quality, and they charge you only $10 for delivery... if you spend over $200 then delivery is free! It'd be cool to do all your "shopping" online before you ever even leave so you're not wasting time at the store when you arrive!