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Navy showers are short, methodical showers intended to use minimal water. 1-2 gallons of water per shower are possible.
The general process is:
Practice this procedure in your home shower before hitting the road.
Truck stops have shower available for purchase. These amenities are designed for truck drivers but are available for anyone. Couples can generally shower together for the same price.
Pilot/Flying J have rewards programs where every 14g of fuel accrues credit toward a shower.1) Love's has a similar program but it requires 50g diesel fill-ups, so it will not apply to many 'dwellers.2)