If your engine uses variable valve timing, suggest to correct this asap. VVT components are very sensitive to the oil viscosity, and can be expensive to repair.
As for the cooling system, it shouldn’t lose coolant faster than 1/2 cup every few months, if even that much. If your Versa is losing coolant faster than that, this also needs to be corrected, as that’ll eventually cause the engine to overheat and repairing that sort of damage can be even more expensive than the VVT. Don’t use foil to replace the expansion bottle cap. Either buy one from a dealership or good chance you can find a used one for cheap from a parts recycling place like Pick and Pull.