And I tried to measure the amount of coolant and found that there was ~2.2-2.7L (some splashed out when I took out the bottom hose so I couldn't be accurate) not including the reserve tank of 0.6L giving a total 2.8-3.3L which doesn't fit the manual which says 5.7L. The http://vehicledatasheets.com/daihatsu/sirion_%2805-%29/1.3_p/0/k3-ve/page-2 on the net says 4.1L total.
The balance of the water is in the engine coolant jackets... duh...