I would imagine it wouldn't be a problem letting the water sit for a week, lots of people do it. I wouldn't let the water sit stagnant though. I'm not sure what the bacterial growth rate is for a week. I usually make up water the day before I need it. I have found that if I let water sit in the container for too long (especially repeatedly, say make up water let it sit, then refill the containter immediately) I can wipe out a goodly amount of brown stuff off of the side of the container after I empty it.
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