I didn't drink it as it is directly from the potable water.
Potable water is safe to drink - That is the dictionary definition of "Potable". Since airlines are concerned to ensure that their passengers are not made sick by the potable water, regular audits are performed of potable water uplift at all airfields and the airfields themselves have similar processes in place. Potable water is cleansed chemically (as is tap water) to prevent contamination.
On most flights, it is likely that passengers will consume both bottled water and aircraft potable water in some mix: A bar service might include bottled water whereas a refreshment round or an ad-hoc request might involve potable water. Hot drinks are normally made with very hot (not boiling) potable water.
Many customers are under the impression that the aircraft potable water tanks are little more than mobile cesspits, with algae fronds waving around in the sludge and a few coke cans, dead birds and used condoms tangled at the bottom. Urban myths die hard and slow.