The answer is yes. Tap water in Athens is absolutely safe to drink. This is why we do not have to buy water bottles since all buildings have direct access to drinkable water from the nearby lakes Marathon and Yliki.
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“You can safely drink tap water in many areas of Greece,” she says. “This includes the big cities such as Athens and Thessaloniki, most of the mainland and certain islands. On smaller islands, such as Santorini, tap water is not always drinkable, so you should drink bottled water.
These goods, together with the original receipt, must remain in their security tamper-evident bag from the time of purchase until final destination. Passengers should continue to present liquids in containers of 100ml or less in a single, transparent, re-sealable 1 litre plastic bag.
Water is safe everywhere in Greece with the possible exceptions mentioned by bob, so no problem in using it for cleaning your teeth, washing food etc. But in a few places it doesn't taste very good - it can be just a bit salty, so you wouldn't want to use it for ice cubes or coffee/tea/drinking.
Bathing suits are for the beach only.Never leave the beach without covering up. Also, it is considered quite rude to go barefoot on the beach. And while there are some nude beaches in Greece they are few and far between.
Expect 15-20 minutes max unless you're unlucky. However since you fly with the luggage, this might take a while, and you can take overall up to 40 minutes before you leave the customs.
There are times when it cannot even be used for making tea or coffee or for cooking as the water is sometimes a brownish colour. Bottled water is used for drinking in these places. In Athens the water is drinkable but may just taste different to what you are used to.