Most ATMs in the country include instructions in English.
It can be a problem to cash travellers checks in Argentina. It’s better to bring VISA and Mastercard, and draw cash from ATMs.
Go ahead and drink the water. Buenos Aires’ water supply is reliable.
Be discreet with cameras and other electronics. Be careful around San Telmo and La Boca, big spots for pickpockets.
Be careful when flagging down taxis. Make sure it’s a legitimate service by calling Radio Taxi.