The conference venue is located in the middle of downtown Bethesda.
This website provides great information about the surrounding area, including a good map and an extensive list of restaurants. The hotel is located in the same place as the blue metro “M” symbol: http://www.bethesda.org/
For your general needs, there is a CVS a few blocks away on Wisconsin Ave in both directions.
The closest places for lunch are Booeymonger Bethesda-($) at 4600 East-West Highway (sandwiches, etc.) and La Madeleine French Bakery & Cafe-($$) at 7607 Old Georgetown Road (fast-casual French), but you can find many additional options.
The compiler of this list can personally recommend the following restaurants but encourages you to explore the area as there are many local options:
For beer and reasonably priced food:
Rock Bottom Restaurant & Brewery-($$)
7900 Norfolk Avenue
For excellent Chinese:
City Lights of China-($$)
4953 Bethesda Avenue
For tasty Mediterranean:
Cava Mezze Grill
4832 Bethesda Avenue
For Mexican and Margaritas:
8130 Wisconsin Avenue
For Spanish Tapas:
7271 Woodmont Avenue