Sorry to post such a prosaic question on a subforum intended for discussion of good restaurants and interesting food, but the answer here will help me with my packing for our trip (we depart Tuesday).
Oatmeal is pretty much all I can eat for breakfast, so I find it prudent to carry lots of packets of the instant stuff unless I know in advance I can buy it there. We are very familiar with Mürren and the small Coop grocery store there, so I know their selection is limited, and I have not previously had to depend on finding oatmeal. Likely they will have Muesli, but I cannot eat that, even cooked, because of the fruit and nuts.
If not available in Mürren, I can search for some in Bern, where we will overnight upon arrival in Switzerland, before heading to Mürren.
Thanks for your help.