Yes, that would make it worse, as pure water/chemically pure water, would be de-ionised water.
Deionised water, and to a lesser extent, distilled water, removes the dissolved metal ions like sodium from water.
The composition of the 'water' in your body, or plasma/extracellular fluid, is approximately 140 mmol/L of sodium (and around 4 mmol/L potassium).
If you introduce chemically pure water into your body, osmosis would occur, and for a balance of sodium ions to occur, water would be ripped out of the extracelluar fluid initially, then the intracelluar fluids, fluids, causing dehydration.
If you make someone drink 'pure water' for any length of time, besides dehydration, you will also cause an electrolyte imbalance, which could cause a cardiac arrest.
I would stop using the smiley faces.