I agree with everyone else that the water is generally harmless; although harmful bacteria can on rare occasion be found in our tanks. The odds are certainally in favor of the water being safe, but not 100% of the time.
I would point out that if there was something bad in your water, spitting it out wouldn't really be much protection from anything. I can think of several analogies to illustrate that point, but I will refrain. Considering the acids in your stomach, bacteria probably has less of a chance of surviving there then it would in your mouth.
I personally start my siphons by sucking on the house, but make your own decision. Don't assume that the water in your tank is harmless just because I haven't got sick from the water in my tank.
- Brad
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