Having never done the "no electricity / no running water" thing for more than a day trip ... I'm concerned too. Moreso concerned since my kit isn't narrowed to a specific decade, and is basically a "16th century composite" armor, and not specifically based on one example, rather than aggregates. Soft kit is generic too.
I'm not too concerned about the poison (Squire! Does this taste funny?
) ... but concerned about the facility cleanliness too. Master Hughes did say the number of port-o-potties would be based upon the number of registrants, so I'm hopeful it won't be 2 toilets to 125 registrants...
At feast, I'm eating with medieval flatware (dual prong fork, spoon, knife - hey, I'm 16th century knightly, I can do the fork
). Saturday's feast is during "closed" hours, so it's not technically "wrong" to use modern utensils if you really wanted, just frowned upon. If you didn't see the note about the mushed peas, they're doing apples/pears/etc instead - which is great since we can skin 'em and eat 'em, and won't have bare hands grabbing at a pile of peas. I'm also envisioning the cutting of the pig to be done with a longsword, but doubt it will actually happen that way....
In regards to food for the other meals - I'm planning on some simple non-refrigerated stuff to take. Some puddings ($10 for 10 4-packs at my local store), probably Nutella and some bread for snacks, some bottled water / gatorade / sodas, etc. There's a store a few miles away, so we'll probably make a daily ice run (I've got the concealed ice chest cooler), and grab a pack of deli meat or whatever, that will stay fresh for the day if it's on ice. I vaguely recall a "mundane food" vendor or two being there during public hours? I can get by without massive loads of food, but I'll have an 18 year old with me, and he can (and may!) eat a horse ... I may need to warn the jousters to watch the horses....
Having a very pregnant wife along would make cleanliness/germs of utmost concern for me too. IMHO, you're very right to question and be concerned.
(BTW, I thought the "tough it out" response/attitude from some people on the FB posts about the conditions at DoK was a bit harsh, considering some of us are first-timers and a long way from home .. hard to tell if it was sarcasm or truthful responses .. so I share the concern too)