Grocery store out of distilled watter :(

if you dont mind a little home project you can make your own, though ruff here it is

"A simple kitchen stove distiller can be made by taking a very large pot with a lid with your water in it (about 1/3 to 1/2 full), floating an empty glass bowl in the water, then placing the large pot's lid UPSIDE DOWN on the top of the pot. Fill the lid with ice and then set the stove to slowly boil the water in the pot.
What happens is that the water vapour travels round the floating glass bowl and condenses on the cold (ice filled) lid. As the lid (should be) is slightly rounded the condensed vapour will run down the underside of the lid and drip into the floating glass bowl. The glass bowl is the collector for your 'distilled' water.

Points to note; The glass bowl should never touch the bottom of the pot or it will boil as well, and the lid should not be a perfect seal when upside down.
For a purer result, discard the first 10ml in the bowl as this could contain impurities that boil below 100C i.e. first!"

or you could just youtube it