Can i make distilled water by just putting regular tap water in a jug and let it set?

No - the water would still have dissolved solids, although chlorine will evaporate in 24 hours. You'd still have sodium, magnesium potium, flouride if it's added to your tap water, and other impurities. You're best to buy distilled water (available at pharmacies and medical supply houses) if you need it - building your own still is a pain.