We also compost, so if that counts, I think we are at <1%. I'm pretty good about freezing stuff if we aren't going to eat it in time. But, I have been getting slack about cleaning up the odds and ends at the end of the week, with the result that I had to toss a couple of small things this week. So, this challenge is timely for me! I need to get back in the habit of making Saturday "leftovers day", where we just eat all the bits and pieces for lunch :)
I have also been burned by "ripen" at home peaches and nectarines. A tip someone gave me that I have been using is to smell the fruit before buying. If it doesn't smell of peach or nectarine, skip it--it probably won't ripen well. If it's firm, but has a strong fruit scent, buy and enjoy in a day or two!
As for soggy cereal, I got nothing. Though if it's a regular problem, start with a smaller portion?