If you’re called to make an unexpected trip and don’t have time to prepare a full-sized bottle charm, making a braid or knot-string out of white yarn or string. As you tie it, say seven times over:
By water and fire, by sky and by stone,
This charm will see me brought safely back home.
Tie the string around your wrist or ankle for the duration of the trip. You can remove it when you return home or let it fall off on its’ own