Do the both of you observe either Levitical or Kosher dietary laws?
What happens if you slip up either accidentally or through weakness?
What happens if you are a guest and you are only served food items that aren’t on your approved foods list?
I don't eat the animals that the Lord said not to eat. That's pretty much the extent of the Lord's law in scripture.
What happens if you slip up either accidentally or through weakness?
Accidents do happen occasionally. When I realize that I've accidentally eaten something then I privately ask for forgiveness, although it's probably not necessary because I'm sure the Lord realizes it's an accident.
Weakness is never an issue. I don't have any desire to eat these things. When I first started keeping the Lord's food laws the hardest part was overcoming habit, not desire.
What happens if you are a guest and you are only served food items that aren’t on your approved foods list?
It's rare that ONLY meat is served. On occasion I have been served pork, shellfish or whatever with our meals. How we handle it is just to skip the meat and eat everything else. I don't make a big scene out of it. Rarely does anyone know that anything is "wrong" and I won't say anything unless someone asks. If they do ask, I'll say I don't eat pork (or whatever) for religious reasons. If they want more of an explanation I'll explain it to them a little more deeply. Mostly people are just curious and in effect it's not much different from how a vegetarian would handle it.