@kgwa welcome to Mayo Clinic Connect and congratulations to your husband on the transplant. What was transplanted? How long ago was it? Early on vigilance is really important (the first days, weeks and months). As more time passes things ease up a bit.
Hand washing, masking and frequently wiping down (disinfecting) surfaces that are commonly touched are simple things you both can do to protect the transplant. BUT outside of home there are no guarantees that other people are doing this. If you go to a restaurant you can wear masks and tell your hostess / server that you need extra precautions due to recent transplant. You can take wipes with you for the table and chairs. You can take a package of disposable silverware. Order a beverage in a bottle or can that you open yourself to avoid dirty glasses &/or contaminated ice (wipe that down too). Go during less busy hours so there are less customers and your server can be more attentive. Ask to be seated away from other people. Refrain from buffets where others are handling the serving utensils, causing spills & mixing food items. Going to a fast food place where you can see the food prepared on the other side of the order counter might be a safer option. You are also more likely to get disposable dishes and utensils that are one time only (by you). (You don’t actually know what goes on in the kitchen and dish washing room.) Just know that during the worst of the COVID time the rest of the world learned and adopted many of the same safety practices that the transplant community follows all the time. That reminds me; many restaurants have take out / to go options so you can buy what you like but eat it at home where you have more control over environmental hazards. Hope this helps.