Here in North America, water crisis goes by another name: Wastefulness.
A toilet uses 2-3 gallons of water every time it's flushed. Most people here flush even when they urinate.
Showers use 3.5 gallons of water per minute. Most people shower every day.
A front-load washing machine uses about 15 gallons of water per load. A top-load machine uses 40.
You add in the water people use to wash their cars, water their lawns, clean their dishes, etc; and things become very serious indeed.
It's hard to say how much water your average North American uses in a day, but it's safe to say that 50 gallons is a low estimate. 50 gallons per person, per day, every day.
You know how much water a healthy person should drink in 24 hours?
Half a gallon. Two liters. One percent of what's actually used by every person!
They say 1 in 6 people in the world can't access clean drinkable water. While here, each person uses enough water to support a hundred others like them. Pardon my bleeping, but that is seriously F%$#ed!
This needs to change. A toilet does not need to be flushed every time. A shower does not need to be taken every day. Clothes can be worn more than once before they need washing, and even then, a lot can be done by hand. Dishes can be washed in a sink, cars can be washed with a rag and rainwater can nourish the lawn. There's so many options that can conserve such an astronomical amount.
Machines are always being developed that use less water, like low-flush toilets, but even then better alternatives are being thought up. Consider a composting toilet
. It uses no water at all, and compost can be used to feed a garden. These negate the need for sewer systems or septic tanks from being built, and composts the waste in less time.
There are many options out there to avert this god-awful wastefulness incorporated into North American lifestyle. People just need to give it a try.
You might be interested in Massive Attack's post on using "grey-water".
Jose Castro Villa's post links to a great video on the LifeSaver Bottle invention (at Ted.com).