Finish the following sentence with the best choice: proper consistency of concrete for a mould

Choices:
- Start with a little bit of concrete powder and mix in water until your mix looks wet with clumps, like oatmeal.
- Start with a bag of concrete powder and mix in oil until your mix looks wet with clumps, like oatmeal.

Answer:
Start with a little bit of concrete powder and mix in water until your mix looks wet with clumps, like oatmeal.