Your HumanMasterPlugin does override your food and drink purchase behaviour according to your logs:
10:02:41 - [HumanMasterPlugin] Out of food, vendor Mike Miller found with nearest food: Moist Cornbread
10:02:41 - [HumanMasterPlugin] We're out of food, go to town!
10:02:41 - [HumanMasterPlugin] We're out of water, go to town!
10:02:57 - [HumanMasterPlugin] We're out of water, go to town!
10:02:59 - [ToTown] Sell items (try 2) (Free slots: 31)
10:03:04 - [ToTown] Buy drink and food
10:03:13 - [HumanMasterPlugin] We're out of water, go to town!
10:03:29 - [HumanMasterPlugin] We're out of water, go to town!
10:03:38 - [HumanMasterPlugin] Food/Drink bought successfully, resetting NPC database to normal