My hair basically goes like this: after shampooing and conditioning, it grows in volume and while it feels smooth and silky, it's also a bit lifeless, thick, I run my hands through them and they just fall back to where they were, like a bush or something. I have medium-length hair on top, short on the sides.
Then usually a few days after that, my hair is perfect. It's still a bit smooth and silky, but it's also "firm", with strands and bangs going here and there, and I can style it just by running my hands through it and pushing it in the direction I want.
Then a few days after that, my hair will go completely dead. Lifeless. Dry. Frizzy. So I'll shampoo and condition, and we are back to where we started.
Question: How do I maintain the texture my hair has in the middle stage described above?
I don't use products but if it can't be done without, which ones should I use?