Depending on what water source you use, if your using faucet water your food will be clean but not totally.
If your using a lake, ocean, bodies of water your food will not be as clean, water from bodies of water are full of bacteria, and other contaminants.That being said, using a faucet is your best bet or even try to clarify water from bodies can help.
I do believe it's all of the above. Although, it might not be trouble sleeping. That might be true in some cases, but not in all.
Answer: white blood cells of the immune system that are involved in protecting the body against both infectious disease and foreign invaders
hope this helps
