ANY water from the tap, be it from the hot or cold, has bacteria in it. You HAVE to sterilize it, I don't care what anyone says. I don't care if it has chlorine in it or not, boil it.
If it hasn't boiled for 5 minutes, don't use it.
Any hose from a shower head is also contaminated. Bacterias love plastics, they move right in. I found out the hard way one year when tapping maples for syrup, to expand operations I tried the (cheaper) plastic taps. Worked fine the first year, but the next year even with boiling they still contaminated the next year's run of sap, and I stayed with the metal taps from then on.
Sanitize, sanitize, sanitize!