Cooling system flush help

[jeeper31]

I did water pump job and am flushing the system. First off I didn't get anywhere near 5 gallons which could be because I had a leak. Anyway, I filled system with distilled water and it only took about 3 1/2 gallons. I let car run until front radiator fans went on and shut the car down. Drained it the next day and only got about 4 gallons, maybe less. I did raise the front of the car. Any water that did come out was on the clear side. I also had the heater on high. Did I do this correctly? I was going to fill up with coolant/distilled water mixture but am wondering if I did it right or should use distilled water to flush it again correctly. I am sort of pressed for time so need to know quickly what I should do.

Thanks so much.