Start with high-confidence first aid books, then narrow by subgenre or adjacent topics.
The Boys' Book of Survival
Guy Campbell
Doctors to the Rescue (peppa Pig: Level 1 Reader)
Meredith Rusu
Water, Fire, Food: Treat Water, Build a Fire in the Rain, Find Food in the Wild
Diane Vukovic
Build the Perfect Bug Out Bag
Creek Stewart
Survival!
Colin Towell, D.K. Publishing
Basic Illustrated Wilderness First Aid
William W. Forgey M.D., William W. Forgey
The World Almanac Guide to Getting Out Alive
World Almanac, World Almanac Books
Survivor Kid
Denise Long
All Better!
Bernd Penners
The Ultimate Survival Medicine Guide
Amy Alton
Firefighters
Katie Daynes