Zurich airportWhile waiting for sf in the Zurich airport, I strolled around the supermarket Migros. With the help of the store manager, I found this Farmer Crunch Corn Flakes bar that is gluten free. I'm not a corn flakes fan but this is quite a good breakfast bar. It is intended for everyone, just they processed the corn flakes in a manufacturing line with no cross-contamination from wheat.

I was planning to search further for gluten free snacks in Switzerland but didn't find much. Though, most of the times I had fruits like apples as snacks and I also had my supplies from home. So it wasn't a big deal.
Grindelwald, Hotel DerbyWhen picking hotels in Europe, I always pick the ones closest to the train station to avoid tugging our suitcases a long way. We stayed at Hotel Derby in Grindelwald which is literally right on the platform of the Grindelwald station.
Breakfast: They don't serve gluten free bread but I had cheese, ham, yogurt, apples, and hot chocolate for breakfast.
Dinner: Since they claimed that they have the best fondue in town (well the town is small and not many others served fondue) and we were too tired to shop around for food, we decided to eat at the restaurant.
We told the waitress that I'm on a gluten free diet and he recommended dishes accordingly. I dount that they checked with the chef for the exact ingredients..... but I didnt get allergy reaction in Grindelwald.
The cheese fondue for sf is amazing but the cheese sauce contains wine and other ingredients, and the key food in a cheese fondue is bread, so I had to skip that - but I tried a bit of the cheese fondue with potatoes, it was really yummy. Some of the best fondue I've had! I had a rosti myself. This is not the best rosti... cuz it was soaking in grease. But the potatoes, egg, cheese and bacon very fresh and delicious...
It is still a restaurant worth visiting given the location, fresh ingredients, and yummy fondue (for your non gluten free friends).

Location:
Hotel Derby, right next to the Grindelwald train station.
Interlaken Given the not-so-satisfying rosti experience in Grindelwald, I ordered rosti again at Interlaken's
Chez Pierre. The restaurant is about 5 min walk from the Ost train station. sf had dried beef which sadly I've also given up. I had rosti with sausages. When I checked with the waitress, she went right to the kitchen to check with Chef Pierre and confirmed the rosti can be made gluten-free. Again, I can't guarantee that they verified the ingredient list of the sausages.... I didnt get much allergy reaction in Swiss =) [I'm not sure what is my tolerance level but my face would be covered with rashes after a MSG-flavoured meal] It was a tasty rosti. I highly recommended this place.

Location: in Hotel Carlton Europe, Hoheweg 94, 3800 Interlaken. 5 min from Ost Train Station
I miss Switzerland where the trains are always on time and well-connected, food is sweet, breeze is sweet, weather is perfect!