何（なに）か and 何（なに）も are constructions that are used in Japanese for expressing ‘something’, ‘anything’, or ‘nothing’. The main difference between the two being that 何（なに）も is used with negative phrases (phrases that use ない or ありません), while 何（なに）か is used in other cases.
To use this expression, we simply need to put 何（なに）か or 何（なに）も before the desired phrase.

• 何（なに）か食（た）べますか？
  Do you want to eat something?
• 冷蔵庫（れいぞうこ）の中（なか）には何（なに）もないです。
  There is nothing inside the refrigerator.