I've started a blog regarding dinghying to grocery stores in western FL. I did this because I couldn't find a single source for this information. If you know of grocery stores that you can dinghy to (free or low cost) that I haven't already listed, please email me.. the email address is on the blog. Here is link.
http://dinghytogrocerystorewestfl.blogspot.com/
http://dinghytogrocerystorewestfl.blogspot.com/