The bacteria is going to be a non-issue considering there will be bacteria coating your tubing anyway. This includes the block, pump etc. etc.
However, if anyone has their own gamma radiation irradiator they can sterilise all components before assembly and as long as the computer is put together in a sterile room or perhaps a tissue culture fume hood with UV lamps to kill bacteria and use deionised + sterilised water, everything will be peachy.
The other alternative is to whack a splash of water wetter into some distilled or deionised water. The water wetter will take care of the bacteria/mould etc. Tap water can be used, but it really is dependent on the quality of the tap water. Here in Australia, if you live along the coast the water has a pretty high level of minerals in it. So spend a dollar or two on a container of distilled/deionised water that won't have any, simply for peace of mind.
Cheers
Memphis
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