Well, Naruto could start with basic water - control drills. For example, he could try to fill different - sized containers with water using only his chakra. Then, he might move on to more advanced tasks like creating complex water formations such as water sculptures. He could also study the water - based jutsus of other ninjas, analyze how they are formed and executed, and then try to replicate them. And, he could train under a master who has a deep understanding of water affinity, someone who can guide him through the nuances of using water - based chakra.
A great fanfiction idea could revolve around the Nidaime's water affinity being passed down through generations. It could show how his descendants in the Hidden Leaf Village also had an inclination towards water - based techniques. The story could detail their struggles and triumphs in learning and mastering these jutsu, inspired by the Nidaime's legacy.
Perhaps a plot point could be centered around the Nidaime training a young ninja with potential in water - based jutsu. He could pass on his knowledge and experiences related to his water affinity. This relationship between the mentor (Nidaime) and the mentee could be filled with lessons, challenges, and growth for both characters. For example, the young ninja might struggle with a particular aspect of water control, and the Nidaime has to find a unique way to help them overcome it.
Well, it could make his combat style more versatile. He might start using water-based jutsus in combination with his existing skills. For example, he could use water clones instead of just shadow clones. This would add an element of surprise to his opponents as they are used to his regular clone jutsu. Also, water jutsus can be used for both offense and defense. He could create water barriers to protect himself and his teammates, and then use water bullets or water dragons for attacking.
Naruto's high water affinity in fanfiction can be depicted in his battles. He might use water - style jutsu to outmaneuver his opponents in unexpected ways. His water attacks could have special properties, like being able to freeze on contact or carry a healing effect. And in some stories, his water affinity is so strong that he can manipulate the moisture in the air to create water for his jutsu, even in arid environments.
In some crossover fanfiction, Naruto might be trained by learning new types of jutsu from other fictional universes. For example, he could learn magic from a Harry Potter - like system, which would completely change his combat style.
A fanfiction on this topic could explore how Naruto's godlike water affinity affects his relationships. For instance, Sasuke might be initially jealous of Naruto's new power but later realize they can work together. Sakura could use her medical ninjutsu knowledge to help Naruto better understand how his water affinity can be used for healing. And the village elders might be worried about Naruto's growing power and try to keep him in check. However, Naruto, with his kind heart, uses his power for the good of the village and to protect those he loves.
Naruto could use his godlike water affinity to communicate with water - based creatures. He might be able to understand the language of fish or water spirits. This could give him an edge in battles as he could call upon these creatures for help. For example, he could ask schools of fish to distract his enemies while he prepares a powerful water jutsu.
In Naruto, typically those with an affinity for water are often from certain clans or have a natural inclination towards it. In fanfiction, Naruto could be given a high water affinity to explore new plotlines. Maybe it's a result of some special training with a water - using mentor, or perhaps it's a hidden aspect of his Uzumaki heritage that was previously unknown.
Perhaps he's been influenced by someone who gives him bad advice. For example, if someone tells him that natural talent is enough and training is overrated. Also, he could be dealing with some personal problems, like a conflict within his family or among his friends that takes up all his time and mental energy, causing him to neglect training.
In some fanfictions, Naruto might be given high water affinity to add a new dimension to his powers. Maybe the author wanted to show his versatility. Since Naruto already has strong chakra control for his wind - style jutsu, extending it to water could make him an even more formidable ninja.