I really like this kit set-up , Jeanette Isabelle. It seems really comprehensive to me. I agree with haertig, that you're probably the queen of FAKs. And I'll say it again, I think it's a really great thing you're doing.

If it was my personal kit, I'd add a little LED penlight or key chain light, or better yet, a headlamp, but I don't know how these kits fit into the bigger picture of the missionaries supplies.

I also carry a Mylar or Heatsheets blanket in mine, but I deal with the threat of cold injuries here that might not be issue in Gutamala, Africa or India. I don't know enough about those environments to wager an opinion, but if there's a chance it could get cold at night, or a cold rain could roll in, etc. It might be worth considering. Then again, it goes back to the big picture of their other supplies, cost and space.

I also keep some water purification tabs in my kit, for sanitation and hydration, but you said that running water isn't an issue for them.