Recipe Ca

CaNO(3)2 is deliquescent. Are there viable alternatives? Is making in situ an option? e.g.

$$\mathrm{CaCO_3 + 2~HNO_3 \longrightarrow Ca(NO_3)_2 + H_2CO_3 \rightleftharpoons Ca(NO_3)_2 + H_2O + CO_2}$$

Any opinions?