The answers below have pretty much covered the answer for you. I have included a link to a map that pinpoints the grocery store options in the area.
http://mapq.st/1nIbOBN (copy and paste into your browser)
I did notice that mapquest has not updated completely. The Genuardi's is closed as is the Superfresh, however right across the street from the Superfresh (#10) is where the new ShopRite is located, and is the closest grocery store to the property you inquired about.
I was originally raised in the Willow Grove area and now live in close proximity to this property. I know that some folks from Willow Grove like being able to walk to a grocery or other store or may depend on public transportation. Did you have any limitations on transportation that made you inquire with this particular question?
I would be happy to further assist you in any way I can.
Please feel free to contact me directly with any other questions or needs.
Coldwell Banker Realty Corp
600 East Main Street
Lansdale, PA 19446
Office (215) 855- 5600
Mobile (610) 256-3019
Fax (215) 368-9480
(content not intended to solicit individuals currently under a buyer agreement or who's property is listed with another real estate professional)