I figured someone would bring this up, but it's the usual case of Araki forgetting stuff or neglecting stuff just for the sake of tension.
Besides Joseph was prob. confident in himself being able to beat him without using Hamon/Ripple.
Wouldn't he need to touch the glass anyway to use the ripple? The water would have overflowed after he removed his hand.
Also, maybe D'Arby would have been able to see him use it, which would have probably been considered as cheating: it's like using a stand.