The Hozuki's hidden ability is to utilise the element of Water in such a way that grants them the ability to turn their entire mass into liquid, or to strengthen muscle mass using Water (as seen with Suigetsu) or the ability to create an extremely condensed drop of water and use it as a weapon (the Water Gun technique exclusive to Hozuki). In short, they are able to utilise Suiton to a further extent than most others. This hidden ability can be used to travel across the battlefield quicker than usual with somewhat reduced risk, it can be used to gain a temporary edge over the opponent, and can be quite lethal if used correctly. In my opinion, the hidden ability of the Hozuki clan is good for attack and travel-based tactics, but lacks largely in defensive capability, save for the Hydrification Technique that still has weaknesses as well. Suiton is quite diverse, many of it's techniques can be used offensively and defensively simultaneously (to a greater degree than most, if not all, other elements). While Water is great for mid-long range combat, it lacks in short range capability.
My training stats in Suiton is C-Rank.