I have spent 7 months of my teenage life washing my hair with only water, nothing else.

I should've.

Do it.

The first week was alright. The second one was horrible. By the third I felt miserable. All in all it took my scalp about 7 weeks to adjust to shampoolessness. For most it takes less time, but my hair was maybe on the greasier side. Why do I say WAS? Because it can change. The reason for the adjustment period is simple: shampoo strips the scalp of its natural oils. This makes the scalp think it should produce MORE sebum. After quitting shampoo the scalp continues to produce excess amounts of sebum for a while, before it understands that the shampoo is gone for good. 

After the adjustment period, my hair became wonderful. The roots were never dry, unlike when using shampoo. My hair was really easy to shape in any way I wanted to. I felt good, as long as I did everything correctly.

The problems were these:

I had to wash my hair every other day. Too frequent for my liking.

I had to really spend time brushing it, otherwise the dust, dirt and sebum would never come off with only water. Without a thorough brushing water seemed only to make things worse. This was a problem for me because I wash my hair in the mornings, yet can't be bothered to get up very early.

Even though I really liked my no-poo tryout, about a month ago I suddenly decided to stop. It ended just as quickly as it had begun. My haircare routine was just too time-consuming to fit into my mornings. So I'm back to shampoo, but not to square one. My hair now needs to be washed less frequently than before the no-poo trial. My lazy self is thrilled by this.