Shampoo/Body wash: I don't water it down, but I use very little. A dime-size amount of shampoo, a nickel-size of body wash in a squishy-puff thing. (Yes, I'm a man and I use a puff thing, wanna fight about it?
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Sugar-Free drink mix: We mix it according to directions, but when I pour myself a cup, I fill it about 2/3 full and then add water to fill the cup.
Minutes: My home phone is a 500 minute plan and my cell is a 200 minute plan (plus free nights and weekends), so I stretch out my minutes by splitting calls between the two and trying to make certain calls after 7pm on the cell, etc.
Laundry detergent: We use less than the recommended amount. How much depends on the size of the load and what is being washed. Using less of a quality detergent lets us pay the same per load or less than if we used the cheap stuff. I've also learned that the cheap stuff doesn't 'stretch' well; that is, if you use less of it, then it doesn't do the job well.
Auto fuel: Basic stuff; don't gun the engine or accelerate hard. Coast sometimes. General, easy driving and planned trip routes.