What a ban here would restrict, if one were declared
A Temporary Use Ban restricts a narrower set of things than most people expect, and it is worth knowing which before one is ever declared. The Water Use (Temporary Bans) Order 2010 lists eleven categories, starting with watering a garden, cleaning a private motor vehicle, watering plants on domestic or other non-commercial premises, cleaning a private leisure boat and running through pools, ponds, fountains, walls, windows, paths and patios.
A watering can, a bucket and water you have collected yourself are never restricted by a Temporary Use Ban. Indoor use is never restricted, and neither is non-mains water. South Staffs Water has asked for voluntary restraint on those same uses. Ignoring an appeal is not an offence and carries no penalty, which is the whole difference between the two instruments.
More: what you can still do, newly laid turf, drip irrigation, business and trade rules.