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I use a Tasmanian Tiger Dump Pouch fastened at the right hand side to the cross strut behind the seat. It takes one or even two 1Liter bottles. If you use a hood, you can sip from a full water bottle in the Milan, but you can't really empty it. So you might have to warm to the idea of using a drinking tube (I don't like the idea of a water bag as well). This one fits a range of bottles.
@Marc - thanks for your input. Normally I use a hood and don't have much space left behind or in the side of the seat. The kit for the bottles look interesting, but for now I will try to find a solution with only bottles..