First of all, my sympathies! IMHO, the hardest task of all after a family death is all is getting through all the post-funeral details that have to be handled, especially when you're in no mental state to do it. We're going through this in my family right now.
While there are lots of good recipes with supermarket ingredients on Sarah's website (www.trailcooking.com), I strongly recommend follow her suggestion of "grab food that sounds good and go for it." Packitgourmet is great, and might be your quickest source for dinners.
In addition to what Sarah mentioned: nuts (concentrated source of healthy fat and protein), cheese (any hard cheese, wrap in cheesecloth so it won't get slimy, if it molds just trim mold off), other types of bars (I love Odwalla bars and Kashi bars), peanut M&Ms (nuts plus chocolate). Cereal bars for breakfast will get you on the trail quicker. Cold cereal--like Grapenuts (compact), dried fruit, dried milk, add water and mix before eating--is another no-cook alternative for breakfast. If the cereal is in a plastic bag, no dishwashing required, either--just lick the spoon.
Take some "comfort food" even if for you it is junk food. You'll appreciate it out there!
Getting out on the trail is the most important thing for you right now!