Taking 4 and 6 year old to Disney. First time there for all of us, first time on plane for unvaxed kids. What can I do to give them a boost before we fly? We are on a very good vitamin regimn, including probiotics. Will start elderberry 1x per day. We've had a rough winter of sickness and are about two weeks healthy and 4 weeks till we leave. Just really praying they dont get sick before or during the trip!