Water bugs

I have never seen a water bug in my life until last week and to be completely honest i would rather not see one again. I am terrified of bugs. Any kind of bug. I hate bugs that fly, crawl, jump, swim and any other way of movement. Last week as I was walking through my apartment I saw the biggest bug I have ever seen in my life. I thought that before I moved into my apartment that it would have been exterminated but I thought wrong. There is nothing worse then finding a bug in your apartment and not knowing what it is or how it got there.