We generally soak our dehydrated food when we get to camp, then bring it all to a boil after whatever soaking period, ten minutes to an hour (in other words, as soon as we are starving and can't wait any longer). Have never had any problems with this method (in Sierra mtns).

As long as everything in there is brought up to boiling point, I think it should not matter. If the innards of the Giardia/bacteria/ whatevers are boiling, we assume that kills them.