A Bucket is a container used to hold and transport things. The most common item held in a bucket is liquids such as Water.
In Calcutta, India Cate Archer had to rescue several Civilians from the fires caused by the H.A.R.M. Super Soldiers. Luckily she was able to find a bucket and a source of water. She was able to extinguish the fires and rescue the civilians. Including the very irate Dr. Harij.
Bucket on Wikipedia