Anything in known quantum can be controlled or modified.
the water which you will use to produce a concrete does not guarantee the same amount or level of sugar in it for all time (in case if it has sugar content).
There is as such no harm to design concrete with such water but when there is change in properties, the results of produce concrete will change more drastically and can even lead to failures, so it is better to use potable water and modify the properties of concrete by using ingredients which you can control instead of anticipating presence of them in water used to produce will help in getting always positive results.
Producing a concrete or designing of same is a responsible task and not the casual activity. it is purely base on the calculations and determination which will always give the desired output at the end of the day.