How many I can't say. I just went with an even number (20 yards). I suppose if the injured are petite it can provide several. If it's Roseanne then one or two? Webbing was $39 for 20 yards of 1.5" wide in red.
https://www.amazon.com/gp/aw/d/B01L2...?ie=UTF8&psc=1
Five pair of bamboo chopsticks were $8
https://www.amazon.com/gp/aw/d/B00XW...?ie=UTF8&psc=1
One pair of titanium were $16
https://www.amazon.com/gp/aw/d/B018P...?ie=UTF8&psc=1