Tereré is the national drink of Paraguay (and also enjoyed in Argentina, Uruguay and Brazil). Made using the same yerba as in other parts of South America, but prepared with cold water or juice, Tereré is usually sweetened. If you are accustomed to hot yerba mate this may sound awful! But you would be surprised – Tereré is a deliciously refreshing drink with a yerba mate twist, perfect on a hot day and a must-try.