Welcome to Ask Wirecutter, where deputy editor Annemarie Conte helps you figure out how to make the most of your stuff in real life. If you have a shopping conundrum for our advice columnist, submit it using this form.Dear Wirecutter,My kid was just diagnosed with gluten and dairy allergies. We’re going to need to start packing our own food for places as well as figuring out how to eat out safely. What kind of gear is important for me to get to make it easier on everyone?M.H.