Container to boil water would be my first choice. I would make a knife from stone and then all other survival necessities can be made from that. A container to purify and transport water can be extremely difficult to obtain in the wild. Can be done though. A good bow drill is easy to make if you practice ahead of time using a sharp edged rock.

Just remember your rules of 3.

3 minutes without breathing (drowning, asphyxiation)
3 hours without shelter in an extreme environment (exposure)
3 days without water (dehydration)
3 weeks without food (starvation)

And the most important rule. Stay calm, use your head and think it through. Panic kills

Ice skates