2 taps, but only one inlet and outlet

Hello everyone. In our bathroom, we have only one pipe in the wall. However, we have a washbasin on which two faucets need to be mounted, as there are two faucet holes. During the construction phase, we bought the washbasin and at the same time only one pipe was installed. Soon, the washbasin will be installed on our own. What options do we have here? So far, I haven't found anything that convinces me regarding possible connections.

no idea... what does the [klemptner] say?

Hmm...

T-pieces are very helpful in this case.

It's not a KNX, is it, or did you expect a star layout for water and sewage? I think I didn't understand the question correctly. Has everything already been plastered and tiled and this is only now being noticed? If not, see

Yes, the pipes have been laid so far. We procured the washbasin ourselves and told the plumber at the beginning that we would install it ourselves. Therefore, he will not take care of it. I have not yet found a suitable T-piece. I only find parts with a small drain on the side. A hose is then usually connected to it. At least not a plastic pipe with 32 or 50mm. I want to avoid using flexible hoses in this configuration. But probably, due to space reasons concerning all the pipes, I will not be able to avoid it. Is there also a kind of flexible siphon?

So I would suggest you first take a picture of the situation.