Diluted ZamZam
Q: Does the Hadith "Zamzam is for the purpose it is drunk for" apply also for a small amount of zamzam which has been mixed with tap water? Also, should we recite the dua "Allaahumma innee assaluka ilman nafia [..]" when drinking such diluted zamzam water? I am asking since I heard that the qualities of zamzam remain even after dilution.