Four mile run

It was on the rail trail, so it was flat, but that didn't make it easy. In fact it is not exactly flat - it has about a 3% grade, so for the first two miles I felt GREAT - fast, strong - did it in under 11 minute miles - which is really fast for me. The 2nd two miles, on the other hand, I had to really work. But I did. I finished the whole thing (4.4 miles, actually) in about 53 minutes. (I walked for a minute or so every mile, and at the last half-mile too.) This is big progress from the runs I'd been doing most of the summer, where I ran 4 minutes, walked one. My next challenge is to do a run tha tfar in the "real world" - where there are hills! I know I can, it's just a matter of giving myself that full amount of time - hard to block out that much on a weekday. I also want to get a different water carrying device - I have a bottle that straps on over my butt but it bounces annoyingly - but going that far without water is very uncomfortable. Maybe those belts with lots of little bottles? They just look so dumb in the store! Any suggestions?