Goal and options: To make wasps go away when having an outdoor event,
output answer: leave cups of vinegar, sugar and salt scattered as wasp traps.

Goal and options: How can I unscrew a screw without a screwdriver?
output answer: Use a butter knife for larger screws.

Goal and options: What should I use in order to make sure the measurements are accurate?
output answer:
You should use a tape measure or ruler.