I think the water-saving attachments you’re referring to are called “low flow” shower heads.  These restrict the flow of water going into the showerhead to prevent waste.  If you took a quick shower, you probably wouldn’t notice the difference in the water you’re using.
assitant
That is definitely true.  One way that people can help to conserve water is to use water-saving showerheads.  Another thing that can help with conservation is having the right water-saving showerhead for the right situation.  But I think a quick shower and water-saving showerhead will use less water than a bath, but it still won’t be as good as taking a shower.
assistant
Does taking a bath or a shower use more water?
user
Humans tend to use more water if they use a bath because it takes more water to fill the bathtub up.  But the average person in America uses about 7 gallons of water per day.  So it would only take about 13 gallons to fill up a bathtub, which wouldn’t be much.  So if a person did use a bath, it would only use a tiny fraction of their average water usage.  But generally bathing doesn’t use any more water than showering, so it’s really a matter of preference.
assistant
13 gallons is a lot of water to use just for a bath.
user
I can see how that would be concerning!  It is.  A lot of water is used for all the infrastructure that goes into making a bath -- both the one in the house and the ones in public areas.  There are also some energy and pollution concerns.  A bath is often the largest water-consuming task in a household.  But a shower can use as much water as a bath depending on how long you run the water.  I think this is probably the biggest challenge in making bathroom use efficient.   I’m glad you asked this question, because it helps me become more aware of all the choices I make when it comes to water use!
assistant
I think a shower will use less water if I take a quick shower and use one of those water saving attachments.
user