Great ideas. I also do the ziploc bag of band aids, wet wipes and aspirin. I also have a small bottle of antiseptic rinse. Once I scrapped my knee and all I had was two bottles of sports drink (note, to self--one bottle sports drink, one bottle water). Besides, you can guarantee dirt or gravel to be involved :-(

Oh, and an small bottle of backup sunscreen and bug repellent wipes.