The phrase 'like a fish in water' is correct and usable in written English. It is used to describe someone or something that is well-suited to an environment or circumstance. For example, "She was born to be a teacher - she seemed like a fish in water when she was in front of the class."
I was like a fish in water".
I feel like a fish in water.
Here I move like a fish in water, the jungle is my home.
He is at home in misery like a fish in water.
"Like a Fish in Water: An Essay on the Benefits of Government That Nobody Notices". August 2017.
Asked where they were, he quoted Mao's dictum that guerrillas must live among the people like a fish in water.
"Mao said that you had to swim like a fish in the water," Montero said, "and the Spaniards believe that they must drain the water to finish off the fish.
"I'm like a fish in the water, honest to God".
He's comfortable in the position he plays, improving with the progressive style of the team, which makes him feel even more like a fish in the water.
"I was like a fish in the water," Journe says.
By Elena Prieto Manolo* moves like a fish in the water around the printing machines of the company where he has been working for the last three months.
Awesome tool! I started using it one year ago and I never had to look for another app
Ha Thuy Vy
MA of Applied Linguistic, Maquarie University, Australia