Aguri watches in awe as the 6 Paths of Pain row across the water.

He gets up immediately after greeting his sensei and starts explaining the liquid element, Suiton.
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Suiton, or more commonly referred to as Water Style/Water Release is an element/chakra release that pertains to water. Suiton has many famous users such as: Tobirama Senju, Mei Terumi, and Yagura The 3 Tailed Jinchuuriki. Suiton usually requires a source of water for the user to be able to perform the jutsu but some users have been so experienced in the usage of Suiton that they could use it with few hand seals and no water source whatsoever. Suiton has a few elements that it forms/combines with to make a kekkei genkai.
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Ice: Suiton forms with Fuuton to create Ice Style. Many notable users of this style hail from the Yuki Clan of Kirigakure. A notable user of Ice Style is Haku Yuki.
Boil: Suiton forms with Katon to create Boil Style. Few characters in the Narutoverse have been seen using Boil Style. A notable Boil Style user is Mei Terumi.
Wood: Suiton forms with Doton to create Wood Style. Few characters in the Narutoverse have been seen using Wood Style. Some notable users of this kekkei genkai are Hashirama Senju and Yamato.
Storm: Suiton forms with Raiton to create Storm Style. Few characters in the Narutoverse have been seen using Storm Style, however it is assumed some unseen Kumogakure Ninja could use it. A notable Storm Style user is Darui.
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In the table of elements Suiton counters Katon by extinguishing and drowning out its flames. However, Doton counters Suiton by absorbing water to the point where it becomes muddy and dries up.
An example of a Suiton Technique:
(Suiton: Hahonryuu) - Water Style: Destruction Torrent
Rank: B
Type: Offense/Defence
Range: Short/Mid
Chakra Cost: 20
Damage Points: 40
Description: After waving the Boar → Dog → Ram hand seals, a water vortex created in the palm of the user’s hand that can then be blasted forward creating a spiraling wall of water which can then be used to attack or defend.
Note: No water source required