couple of suggestions..
4x4 non adherent pads
duct tape on card
small super glue
whistle

otc meds..
aspirin/ibuprofen/acetiminophen
Katadyn ClO2 tabs
immodium
benedryl

upgrade the Micra to a Squirt S2, add good tweezers
for urban use, a section of hacksaw blade and split ring might be handy to open a padlock