Water and Heartburn

I have never been a water drinker. Always coffee in the morning then switch to diet pepsi the rest of the day. My entire diet has been 100% unhealthy the last few years and I've gained a lot of weight due to that. I know I need to drink water and I am committed to doing that. But I get heart burn alot from drinking water. I only know one other person that says the same thing. Most people look at me like I'm crazy. But I was wondering if any one else has expirienced this and if so, any remedies? or is this just weight related??