A dry shampoo or hair powder really is a great option, and not too many people utilize this product. It may be that they are scared of it, or unsure of how to use it. Either way it is one of my favorite products for mulitiple reasons.
First of all, a dry shampoo really does what it says. It is a dry product that you add to your hair when you don't want to wash, or want to stretch out your hairstyle another day. It will cleanse your hair, will absorb oils, eliminate any odor (but really, if your hair is smelly you really should wash it) maintain hair color longer because you are shampooing less, can add volume, bounce, will save your hair from heat damage because you aren't styling as much, and can give your hair texture. This is a great product if you need to add some grip to your hair and fabulous for big hair styles (all of my friends know I am deeply in love with big hair!) and updos.
They work great and can give your hair a tossled sexy look to it.
For color treated hair, I would recommend the Bumble and Bumble hair powders, because they come in white, blondish, red, black, and dark brown. This is a great way to temporarily blend roots and still do everything a dry shampoo does. Just beware of your pillow cases and running your fingers through your hair since it will come off.
So if you are in a rush, out camping, no access or are wanting to conserve water, or just plain lazy, try a dry shampoo or hair powder!