Hi georgia,
We can live in water, but we cannot breathe in water. So we would need to come to the surface to breathe, or have an air supply from scuba diving apparatus. We cannot breathe in water because our lungs don’t work when they fill with water.
To breathe underwater you need gills, like fish have. Whales and dolphins also don’t have gills, so they have to come up to the surface to breathe.
Nothing I can add to James V’s answer, but for me water is a really interesting substance, as it is both vital for our lives and yet it can easily kill us!
We could live in water is we really water to we just couldn’t live underwater without any technical help because we cannot breath underwater. We cannot get oxygen from the water the way that fish can as we don’t have gills.
The best we could hope for naturally would be to train ourselves to be able to hold our breath for longer so that we wouldn’t have to come to the surface to breath too often
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