Welcome to the Healing Well GERD forum! You're definitely in the right place. I hope you'll have access to you computer as you travel, so you can share your experience and ask questions as you go.
If you haven't read my surgery/recovery journal, check out the Day 9-13 part of the post for my experience at that point.
At Day 9, you'll still be in the thick of recovery, as this surgery takes a full 6 months for most of the healing and a full year for the rest. That said, if you have a realistic attitude about the fact that you'll be in the beginning stages of recovery from major surgery, and listen to your body, you should be just fine.
Baby food is one of the staples that many here have used to help maintain nutrition during the early stages of recovery. You're in a tough spot because of your food allergies, and I can see you're already coming up with some alternatives.
As you'll read (or have read) in my journal, my surgeon set me free to eat "whatever [could] be chewed to a liquid" at Day 6. In that way, you have the convenience of carrying your own personal blender (your teeth) with you wherever you go. The trick is to take tiny bites and chew, chew, chew. If whatever you're eating can be chewed to a creamy consistency, you're good to go. If you mistakenly start chewing something that doesn't chew completely, deposit it discreetly in a nearby paper napkin.
Stay away from iced drinks (they can cause spasms and discomfort), and don't use straws (they introduce more air into your stomach and can add to bloating). You'll want to keep your narcotic pain meds on hand to help with sleeping, as pain that is no longer with you during the day, can crop up at night, when everything is quiet and it's easier to notice.
I suggest that you start walking slowly right away (as soon as you feel able) after surgery. My night nurse gave me that great advice, and I was walking the halls in he hospital whenever I had to get up to go to the bathroom. If you walk as much as you're able right away, you'll be less likely to be bothered by the dreaded shoulder pain that can occur. The added bonus is that you'll be keeping up your strength in anticipation of your trip.
Just listen to you body. If it tells you to take rest, then rest. I'm sure you'll be able to enjoy your trip, but with limits that your recovering body puts on you. Go with the flow...follow your recovery and don't fight it.
Do some research to see what soft foods you can eat. Bread is a no-no in the early recovery weeks anyway, so you won't be missing anything anyone else doesn't have to miss as well. If there are some gluten free alternatives, be sure they're toasted well and a bit crispy before trying them. Then chew to a liquid, and you're in business.
Here's a great eating resource...you can check on which of the recommended foods you can eat with your allergies:
I'm sure others will be by to share their experience and tips. Be sure to continue to ask any question that come to mind, and we'll do our best to provide answers. Everyone's recovery is unique, but we all go through certain experiences that seem to be universal.
Good luck with your surgery, and have a wonderful trip!
Words of wisdom by Eckhart Tolle:
"Whatever you fight, you strengthen, and what you resist, persists.”
“Worry pretends to be necessary but serves no useful purpose”
“Accept - then act. Whatever the present moment contains, accept it as if you had chosen it. Always work with it, not against it.”