I need ideas for lunch food

 I go through this every year or so: I'm bored of my current lunch option and I need to figure something else out. 

Here's the problem: I may or may not have access to a microwave or refrigerator and I don't know until the morning of if I will. Sometimes I leave the office to go out to the field part way through the day and so can't heat something up. I like to have lunch planned for the week ahead of time. 

Here's the other things: Salads are terrible and I will not eat them. I don't like leafy greens, raw tomatoes, onions. Even "salads" that are a mix of fruit and vegetables that I like aren't good because they aren't filling. I'm usually hungry within an hour. I highly dislike mayo and vinegar based things. 

I usually eat fruits and veggies as snacks through the rest of the day along with granola bars and crackers and things like that.

So here's some things I do eat: sandwiches with cheese/dried beef (only lunch meat I'll eat because warm lunch meat is disgusting), sandwich with PB&J, mashed potatoes, boiled potatoes with cheese, cornbread with cheese/dried beef, and I'm trying to think if there's anything else. I usually rotate between these every couple of months. 

It has to taste good at room temperature. Does anyone have any ideas?