It is well known that when water flows through a tube you can make it flow faster by making the tube narrow.

No it isn't. A tap is a tube with a section which can be made narrower or wider. Does water flow faster when you turn a tap off?

If you have a constant-volume flow of liquid through a tube, regardless of back pressure, then a narrower tube will require that liquid to flow faster. But this requires a pump (or other source) to force water down at a constant rate. If the liquid instead is flowing with constant pressure (a more normal situation) then the narrower tube will let less liquid through. Higher pressure will result in more flow, but it will still be reduced compared to a wider tube.

And this is exactly the same with people.

It is well known that when water flows through a tube you can make it flow faster by making the tube narrow.

No it isn't. A tap is a tube with a section which can be made narrower or wider. Does water flow faster when you turn a tap off?

If you have a constant-volume flow of liquid through a tube, regardless of back pressure, then a narrower tube will require that liquid to flow faster. But this requires a pump (or other source) to force water down at a constant rate. If the liquid instead is flowing with constant pressure (a more normal situation) then the narrower tube will let less liquid through. Higher pressure will result in more flow, but it will still be reduced compared to a wider tube.

And this is exactly the same with people.

Your question only arises from you having a belief in how fluids flow which is incorrect. The situation you ask for does not require any special fluids - water will do fine.

It is well known that when water flows through a tube you can make it flow faster by making the tube narrow.

No it isn't. A tap is a tube with a section which can be made narrower or wider. Does water flow faster when you turn a tap off?

If you have a constant-volume flow of liquid through a tube, regardless of back pressure, then a narrower tube will require that liquid to flow faster. But this requires a pump (or other source) to force water down at a constant rate. If the liquid instead is flowing with constant pressure (a more normal situation) then the narrower tube will let less liquid through. Higher pressure will result in more flow, but it will still be reduced compared to a wider tube.

And this is exactly the same with people.

The answer is that you don't need a different liquid, you need a better understanding of physics.

It is well known that when water flows through a tube you can make it flow faster by making the tube narrow.

No it isn't. A tap is a tube with a section which can be made narrower or wider. Does water flow faster when you turn a tap off?

If you have a constant-volume flow of liquid through a tube, regardless of back pressure, then a narrower tube will require that liquid to flow faster. But this requires a pump (or other source) to force water down at a constant rate. If the liquid instead is flowing with constant pressure (a more normal situation) then the narrower tube will let less liquid through. Higher pressure will result in more flow, but it will still be reduced compared to a wider tube.

And this is exactly the same with people.