dirty unwashed hair

Hi, when I wash my hair, it generally poofs up into something like a large mushroom as it dries, and I don't like how that looks.

I love how my hair looks when It hasn't been washed in weeks. Like, how my hair looks after a hard backpacking trip where I sweated every day, met a lot of dust, etc. It forms strands that stick together, it gets denser, lies flatter, and sometimes it sticks out and I look a bit like an anime character.

I am new to hair care, as I have only ever used natural shampoo or basic shampoo / conditioner all in one stuff on it. My question is, how can I make my hair like this and still take showers? What would be the best way to make my hair look like it has gone through hell?