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The system is designed so that if there is sufficient temp/expansion/pressure while running, some water will get past the valve in the cap and go to the secondary tank between the cylinders. When the engine cools down, it sucks it back again. So you shouldn't see any loss beyond minimal losses to evaporation.

Next time you run, keep an eye on the level in the tank after every session to see where the level is. If it doesn't get to the top and you're still losing water, you have an internal leak. Water in the oil will collect as a milky emulsion in places where the temp doesn't exceed 100C, like under the filler cap, but you may not see it if the quantity of water is small. Most likely candidates for the leak are cyl gaskets and water pump seals.
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