Question

What is the Rabbi’s opinion about the major leniencies practiced abroad regarding new grain? I understood from Rabbi Knohl’s book And You Shall Eat and Be Satisfied that this is a fairly questionable leniency, and even though everyone follows it, it is preferable not to get involved in such a problem, which is Torah-level… (I hope I understood correctly..). The issue is that this is practical if you’re on a one-week trip abroad, but I’m about to leave for a year-long mission, and the question is whether, when I stay with families or buy in a kosher supermarket, it is forbidden to eat anything containing wheat/barley, since there is no real basis for the leniency that everyone there relies on? And if there is nevertheless some basis, could you please explain what it is?