Can salt and water be obtained from a reaction between a gas and an acid?
If you want to get salt, then you should look for a volatile base.
$\ce{NH3}$ does our job here.
$$\ce{2NH3 + H2SO4 -&gt; (NH4)2SO4}$$

However, I am not sure if water could be formed. If there exists something like $\ce{NH4OH}$ vapours, then sure, water will be formed.