Ok, wife has put me forward for The island with bear grylls season 2, and on the extremely fucking low chance I getin, I want to be good at this.

I land, i make shelter, I source water then i source food.

After that, wut do?

How should I make my shelter? I know I walk the coast to find a water source in land, how do i tell what food will kill me? Any images, stories or anything, if i get to do this, I want to be good at it.