I feel as though traveling at 6 weeks would be manageable. You may be pretty tired and I would be even more aware of your eating/vitamin/water schedule because traveling would make it easier to forget. I would have on hand protein bars, meat/jerky sticks and other high protein shelf stable foods that you can keep on you at all times. As for eating out, I eat out quite regularly and I find the best thing to do is to order a portable scale off of Amazon. I keep it in my purse and I got one with a lid so it will stay clean. I can only eat 2 oz and still remain comfortable, the scale has been perfect so I don't overeat. I stay away from the kids menu because the options are usually fried or a lot of carbs. I always share with my husband.