Bellatrix Black
After basically opening Pandora's box, Bellatrix found the first open tree house and made her way inside to settle. She was quick to retreat when the rain started pouring. Last thing she wanted was for anyone to realize she was the first on the scene.
As for her supplies. She brought with her, her hunting knives from the previous village. She also brought a large backpack full of liquor. She expected Evan to follow closely behind, obviously. She also layers up her clothing. Just to make sure she had a change of clothes on her person.
Other than these items this is all she brought with her.