Calcium vitamin supplements are kind of expensive for this.
You can get 40 lb of Soil Sweet (dolomite lime) at HD for less
than the cost of a bottle of calcium supplements. Ditto for
25-40 lb of gypsum at big box store garden sections.
Anyway, since you already have roots in the water reservoir,
if you put calcium in there it should be taken up by the plant
as it dissolves just fine (plus it will wick up with the water).
Cherry tomatoes tend to be less prone to BER than larger
fruited varieties, too.
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