Early on the best water team is 3 star Kakashi, 2 star Sasuke, 2 star Hinata.

Hinata *x *x
*x *x *x
Main Kakashi Sasuke

Poison Fog Wave until you unlock Healing Jutsu
Healing Jutsu
Chakra Dissection Blade
Neurotoxin

Fight starts with Poison Fog Wave, then when Kakashi clone dies and you get 20 chakra decide if it's worth using it now or carry it over to next turn, it might be waste using Hinata skill now after they used their combo to kill clone.
Turn 2 Sasuke mystery who ever you think will be most likely to use a skill (like lightning main) and use Hinatas skill if you carried over chakra from Kakashis clone.
Turn 3 Kakashi mystery who ever you think will use a skill and you probably won if you managed to block 2 skills by this point.


They have huge damage combo early game with acupuncture/ignite/immobilise, you won't find better team till level 50~ when you can start getting summons.

Kakashi is from 7 day log in when server stars so everyone gets him early, or he is very common from draws.

Because going first wins games.