Just get some extra shells an you'll look like a proper upright mermaid!
Swimming, baths, it doesn't really mater, just make sure you get to submerge yourself frequently. See, the skirt fits tight around the thighs, and then falls to the floor around the knees, so it looks just like a mermaid tail! No? Now doesn't that feel more natural? For instance, you could wear our Adult Mermaid Costume. Have you always felt like a fish out of water? Like you just didn't quite belong? You're totally a mermaid, aren't you? Firstly, get some quality water time. We've had that reaction before too.