Yes. Humans can drink distilled water and people do, on ships running desalination plants, in laboratories, in emergency situations and at home from countertop distillers. It is simply water with the dissolved minerals removed by boiling and condensation, and nothing about that makes it unsafe to swallow.
Where people already drink it
Shipboard supplies have been distilled for generations, and evaporative desalination plants supply whole cities in parts of the world with the mineral content adjusted afterward. Survival stills, solar stills and emergency distillation are standard techniques for producing drinkable water from a contaminated or salt source. In all those cases the water is distilled and people drink it routinely. The practice is established; the concern about it is a modern internet phenomenon.
What is missing from it
Distillation leaves behind whatever will not evaporate, which means the dissolved minerals, most metals, nitrates and any microorganisms stay in the boiler. It also means the water contains no calcium, no magnesium, no sodium and no fluoride. That is why it tastes flat: your palate reads the minerals as much as the water. It is worth knowing that volatile compounds boiling close to water can carry over unless the distiller has a carbon stage, so it is not automatically a cure for a chemical contamination problem.
The household uses that come up most
People often ask about drinking it because they already keep it for something else. CPAP humidifier chambers, steam irons, humidifiers and car batteries all specify distilled water to avoid scale and mineral deposits, and the jug in the cupboard prompts the question. If you are mixing infant formula, follow your pediatrician's guidance and the formula instructions, since fluoride content is part of that conversation. For an adult filling a glass from the same jug, there is no issue.
Whether you should make it your main supply
Safe to drink is not the same as the best way to supply a house. Distilling is slow, uses electricity and gives you flat water, and if the reason is distrust of the tap it is worth checking what your utility actually reports. Every community water system publishes an annual Consumer Confidence Report and the EPA maintains a finder for it. Read yours, test if you are on a well, and then decide between distilling, filtering and doing nothing on evidence.
Questions people ask about can humans drink distilled water
Can humans drink distilled water every day?
Yes, on a normal diet it presents no known problem. The minerals it lacks come mostly from food rather than from drinking water.
Is distilled water the same as purified water?
Distilled is one type of purified water. Purified is a broader label covering reverse osmosis, deionization and distillation among other methods.
Can babies drink distilled water?
Distilled water is commonly used for mixing formula, but follow your pediatrician and the formula instructions, since fluoride intake forms part of that advice.
Does distilled water hydrate you as well as tap water?
Yes. Hydration comes from the water itself, and the small mineral difference between distilled and tap water does not change how it is absorbed.