you can totally do it. I used to travel across the country every other week (and be gone for a week) for work while I was still nursing. it's not fun, but it's doable. get yourself a good electric pump (one that takes batteries so you can use it on the plane too, oh the fun of pumping in an airplane bathroom!), and establish a regular pumping schedule. This is key! you should try to pump at the same time every day to keep up your supply. I was actually able to freeze the breastmilk and bring it back for my baby, not sure if that will be an option for you. hotels (at least in the US) are pretty accomodating about that stuff and may let you use their industrial size freezer for a nice deep freeze, so the milk can last on its way back to the little consumer. I stored the milk in the little ziplock breastmilk bags, which works out pretty good, and brought it back packed on ice. airlanes have no restrictions on carrying breastmilk, even if the baby is not with you!
If you don't plan to bring the milk back, then you just have to pump & dump (sad, but still good, as you will be able to go back to nursing when you get back).
Make sure you have enough stored for the little guy before you leave, so pump extra when you can for a few weeks before your trip, so that you have at least a week's worth in the freezer for while you are gone.
If you are on vacation and plan to be out and about all day, that may prove a challenge in terms of finding a quiet place to pump, so just make sure you know where you are going every day so you can "map out" a places to pump. going back to the hotel 3 times a day may not be a good option.
As for the baby going back to the breast after a week of the bottle, my daughter never had any problem with that.
Have fun!