I'm particularly interested in the food served and first hand accounts from guests/travelers. I would really appreciate it if someone could point me in the right direction.
You might like to check out The Intoxicants Project: https://www.intoxicantsproject.org/ It's not specific to inns, but looks at the material and visual culture of drinking in the 16th to 18th centuries, so you will find lots of relevant material.
You might also like to get hold of Alehouses and Good Fellowship in Early Modern England by Mark Hailwood (2014); as well as Drink in the Eighteenth and Nineteenth Centuries: Perspectives in Economic and Social History edited by Susanne Schmid and Barbara Schmidt-Haberkamp (2014).