This question is probably directed at household customers (many of whom will not know how this compares to ‘normal’ usage). It might be better to ask whether customers would be willing to halve their usual water use).    This question could also be asked of many non-household customers. However, for a water-dependent business like a car wash, farm or manufacturer halving their output would be difficult. If the question does not apply to water dependent non-household customers, then this should be made clear.