How sound are the following hadiths: "Drink water to your fill (lit. eyes)", "Speak the truth even if it is bitter", "Paradise lies at the feet of mothers", "The father is the middle gate of Paradise", "Cleanse yourselves, for Islam is clean"?

The hadith "Drink water, O eyes" has not been found with this wording. The similar wording "If you perform ablution, then let your eyes drink water" is very weak and fabricated.

As for the hadith "Speak the truth, even if it is bitter," it is authentic.

The hadith "Paradise is under the feet of mothers" is fabricated, but its meaning is correct. It is sufficed by the hadith "Cling to her, for Paradise is under her feet" and the hadith "The parent is the middle gate of Paradise," both of which are authentic.

The hadith "Cleanse yourselves, for Islam is clean" is weak, and nothing from it is authentic. It was narrated with the wording "Indeed, Islam is clean, so cleanse yourselves, for none shall enter Paradise except one who is clean," and this is fabricated.