how to create a rectangular bucket tetrahedral format?

[billierios]

hi
I've tried to create a bucket in a rectangular form and trying to assign it as a tetrahedral mesh. while no matter how many times i tried, once the bucket layer is under impact, the layer will deform or wrap on the particle that impacts on it.
How can i fix it? can anyone teach me on this issue?
Thank you soooo much

one screenshot for a bucket that should be created is been attached, which I got from a third party.