You can eat lots of sweet potatoes (make oven fries or fry them), regular potatoes (butter/sour cream), avocados.... If you are fine with corn then get fresh corn tortillas and make fajitas (with or without meat).
As stated, avoid eating out. It is an adjustment but you just have to make sure all meals are prepared. I just returned from a 14 day trip to California and I ONLY ate out once and that was fries at In-N-Out because I was too afraid of getting sick in restaurants. I cooked all my meals at my hotel or in friend's homes. Better than spending a day of vacation sick!