In a tall glass place a shot of water. Add instant coffee and sugar. The more coffee the more stronger. It's up to you how much sugar you will have. With no sugar we call it 'sketos' (plain or black), with 1 tsp 'metrios' (medium), and with 2 or more 'glykos' (sweet). Blend with one of those small hand mixers. Add a splash of milk or more if wanted. Add lots of ice and fill it up with cold water. Serve.