How do you do it?

I was just thinking in the shower, as I do a lot, some of my greatest and most random thoughts happen in the shower…The one I had today was what do you do when you have a great thought for a Blog, but then have not much, or nothing to write down with? The only tool I can think of is having a little notebook in your bag at all time, or to have to “text” myself…What I’d really like to know though, do you have other suggestion?