Anyone knowledgable in Chemistry??

I had to design my own intermolecular forces lab and evaporated isopropanol alcohol, distilled water, and tap water on a hot plate and timed how long for each one. Theoretically alchol is supposed to evaporate the fastest but i don't know whether water or distilled water evaporates faster. My data shows that distilled water took the longest to evaporate. What are the properties of all intermolecular forces, I know that alcohol has a weak one so thats why it was easier and fastest to evaporate. I tried looking up about distilled water but couldn't find any information. And I have to write a conclusion so what types of things can I write about how why things happened the way they did? Thankkks