If water is only drawn from the cold faucet, then no, the water heater is not involved. However, if water is drawn from the hot faucet- even for a few seconds- hot water IS withdrawn from the heater,...
It's when you strip opiates of a drug that prevents them from being used recreationally. For example, Vicodin contains hydrocodone and acetaminophen. Hydrocodone is the opiate and acetaminophen...
If you use cold water, your drink will become diluted, Using ice allows the cooling of your drink with less dilution, as the ice takes a while to melt.