Let's say I wanted to set up a kitchen/home that was kosher enough for most of the Orthodox spectrum to feel comfortable eating and staying in. (By "most," let's say the first two standard deviations of that spectrum, imagining for a second that it were a normal distribution.)* How would I go about doing that? What types of special considerations would there be?
Some I can think of:
- Possibly keeping cholov stam and/or non-Chabad* meat and/or pas palter and/or non-"big five" hechshers out of the kitchen (not sure which of these, if any, are necessary)
- Possibly keeping countertops and fridge shelves separate for milk/meat (not sure if necessary)
- Not having pets (not sure if necessary but probably helpful)
- Having separate beds in the bedrooms, mezuzos on all doors
- Having negel vasser sets in the bedrooms
- Not having obviously objectionable art/magazines/books or controversial seforim lying around
Secondarily: Would there be halachic grounds for them to take my word that I had done all this? (Assume I am a shomer Shabbos, shomer kashrus adult Jew.)
Related: What is the basis for eating in someone's house without a kashrut certificate?
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*Put another way, I would like to be able to host Lubavitchers and some other Hasidim--not the strictest in either group, and not during Pesach--for Shabbos, for example. (If you wonder why I didn't just ask, "How can I make my home kosher enough for Lubavitchers to eat and stay in?," it's not because that's not functionally equivalent, but because that wording doesn't as accurately reflect my goal. Additionally, I think the question as titled is of more general interest.)