What do Orthodox Jews eat when they are travelling to another city and are unsure what's kosher?

There are many kosher symbols that are international such as the COR and the OU symbols- many countries stock products with their symbols not because they are kosher, but because they are on common products. Additionally, you look up the local Beis Din or Rabbi and find out what facilities are available. If there are no local Rabbinical authorities- then you are eating raw fruit and veg for as long as you are there.

Edit: A correction to what Tseruya has stated in her answer. You CANNOT eat at a salad bar in an unkosher restaurant for a number of reasons.

1) Fruit and vegetables have to be checked for insect infestation in specific ways

2) Many use wine based vinegars in their salad dressings. Wine based vinegars have to be kosher to be used and an unkosher restaurant is very unlikely to be using a kosher one.

3) Many garnish their salads with bits of bacon etc.

4) Anything cooked has to be cooked in a kosher kitchen with kosher utensils or it is unkosher. Since many salads have cooked items in them- they are unkosher.

You are right, fruits and vegetables. We try to get a hotel suite that has a cooking area and then can also cook our own vegetables and fruits (they need to be checked for bugs etc). We also carry those instant packets of soup you can put in a cut and add hot water too. Some are kosher and that solves a big problem. If we are in the SUV we have a cooler with food in it and of course, it's all kosher.

However laws of kashrut are the same everyone, you just need to have faith that the shochet (person who butchers the animal) is truly keeping the law. You also have to have faith that the meat was prepared in a kosher way (blood drained etc). So, because of all that, it is hard to know and we eat fruits and vegetables, pastas etc.

Hope that answers your questions. Sorry, but I am bored today so I droned on and on. LOL

When we (orthodox Jews) travel to another state, we find out ahead of time whether or not there are acceptable kosher restaurants there. We do this either by going online or by contacting the Chabad rabbi or another orthodox rabbi in the desired area.

We do the same when visiting another country. In extreme cases, we pack a suitcase of kosher non-perishables (tuna, crackers, cup-a-soup) and fill the suitcase (which is emptying of food during the trip) with gifts and souveniers for the trip back home.

Kosher really applies only to foods that are meat or have meat products added in their preparation. All other fresh foods and grains are all right and of course, there are many packaged foods that carry a kosher food certification to be found in a store. It's best to pack along what you can.

Kosher restaurants? It depends where you are. If we are in a non-kosher restaurant with a salad bar, it's all right to eat from that but we abstain from its hot foods.

They simply do not eat meat and go vegetarian.