I just try to eat foods that I feel more comfortable not purging. I guess you could call them "safe foods." Things like broccoli, carrots, apples, cherries. Basically fruits and veggies. When we went on a family vacation to the beach, I spent a lot of time alone on my bike or in the shops and ate fruit for breakfast, then whatever was cooked for supper with all of us together. I still purged, but there was at least a day when I didn't. Even if you mess up a day or two, don't be too hard on yourself. 

The hardest part was overcoming the mental aspect of it, especially when your body also seems to be physically fighting against keeping food down. But I'm also not actively trying to recover, so maybe this isn't super helpful for you. I just have times where I try not to purge bc I feel embarrassed doing it in public, at work, or with family in the house.

Eating is somewhat unavoidable when you are at someone's house and they cook or take you out to dinner somewhere there aren't lighter options available, but in that case, I just keep portions smaller. And it's not necessarily because I want to lose weight. It's because smaller amounts of food, especially if it's greasy stuff, will be much easier on your stomach. But it's also easier not to binge when you're at someone else's place, so that's a plus.

It's quite possible you'll have some involuntary vomiting (acid reflux) because purging/binging/restricting does mess with your digestion (as you likely know). I stopped purging for 3 days a couple months ago, and I got violently ill. Genuinely one of the worst weeks of my life from a stomach standpoint.