Answer: If it is a new house, the plumbers hooked it up to the hot water supply--this actually happened to me once! Otherwise, it may be really hot outside and the water has been warmed before coming into the house.
Answer: In answering the question, there are a few things that need to be considered. The first is that lead is a naturally occurring element, and it is ubiquitous in nature, meaning that it is found everywhere. Therefore, all fishponds already have lead in them to some degree. So the first consideration is to remember that your question becomes a question of presence versus significance. Next, not all lead is equally toxic. The oxidation state and the anion associated with lead in a particular compound will heavily dictate the significance of the presence, even in environments where the content is very high. A good example of this is when the lead is present as the mineral galena (PbS). Although galena is some 87% lead, and may be present in large quantities in the bed of the fish pond, PbS is not particularly bioavailable, and therefore, its presence, even at high concentrations is not biologically significant. In the other end of the biological scale are the organic leads, such as tetraethyl lead and tetramethyl lead. These leaded compounds are particularly bioavailable and can be of considerable concern in the aquatic environment. Finally, the last consideration is the food chain. Different kinds of leaded compounds will bioaccumulate to different degrees. And, depending on the food, chain, may therefore enter higher omnivores and carnivores in the surrounding environment, and may (but not necessarily) effect the health of those animals as well. So the answer to your questions lies with properly defining the word "contaminant" and recognizing that the mere presence of lead does not equal contaminant, even at very high concentrations - rather of greater importance is the significance of the lead, based on its bioavailability in the context of the existing environment.
Answer: Because most sodas contain about 60-75mg of caffeine, as compared to 150mg in a cup of coffee, the diuretic effects are rather small and considered not significant by most professionals unless consumed in larger quantities (5 times a day or more). The diuretic effect is much less pronounced that that seen when medicinal diuretics like Lasix are taken.
Answer: People prefer to drink mineral water rather than tap water as mineral water has had all the bad microbes taken out by a filter. Tap water however, has had the bad microbes taken out with small amounts of chlorine The chlorine is not good for you to drink. Now though, at home you can by a tap filter to get mineral water out of your tap.
Answer: Not necessarily but you will not be very well for a long time.Domex is mostly sodium hypochlorite which is highly corrosive. Ifingested (swallowed) it will cause burns to the mouth and throat,and sickness.