Reinforce the formation of water and mountain

In the flying star report, it is stated as follows: Mountain Star is found in the front of the house, while Water Star is found at the back of the house. This is deemed inauspicious unless there is water at the back and mountain in front to reinforce this formation.

Can I create mountain in the front and water at the back myself? What would you recommend to rectify the situation. Thank you in advance.