Final answer:
The best type of water for making concrete is potable water, but river water can also be used if it is free from contaminants and treated properly.
Step-by-step explanation:
The most satisfactory type of water for making concrete is potable water (drinkable water). Potable water ensures that no harmful levels of chemical pollutants or microorganisms are present, which could potentially affect the concrete's setting time and strength. However, river water can also be used, provided it is free from harmful contaminants, excessive amounts of dissolved salts, and organic materials. It is important for the water to be treated if necessary to remove any undesirable substances before use in concrete mixing, to maintain the integrity of the concrete structure.