Would like to see a few improvements

I like this app and have used it everyday for the last 4+ months. I like how fast you can record your water compared to my other water app and I like the awards. They are cheesy I know but kind of a little incentive to keep using it.
Few things I would like to see different and I would change my rating to 5 stars. I would like to have custom pictures for the bottles. I like that you can change the volume easily but sometimes have trouble remembering volume of certain containers. Would like it to be easier to modify previous days entries and not just add but delete too if u screwed up. Would like to see a graph for more than just last 30 days. Would like to see improvement on the average percentage - it does not appear to be calculating it correctly - took me 3 months to get over 90% and when I did I only had 2 days in last 30 that were below 90 and only 3 days total below C grade for the entire time using the app and those were from days 1-3.

Kpfen about Water Your Body, v4.0.1