Comment by I love bl sm** on The First Love of the Sushi Restaurant Owner is a Mermaid - Chapter 13

So I'm confused can someone please enlighten me when they go onto the water? Do they have to take all of their clothes off and get naked so they can turn into a mermaid in the water? What is the clothes just disintegrate or something I'm so confused also my second question is how do they get their mermaid tail? Like is it as soon as they touch the water do they get their mermaid tail because if that's so how do they take showers like mermaids how do they take showers? I need like a whole entire comic dedicated to their anatomy. I'm so confused.