In a clean bowl,cut your lemon and squeeze the water from it.

In a pot pour 1 cup of water and add your sugar put it on fire and stir till it's melted and turn off your heat.

Let it aside and let it cool completely before using it,then strain your lemon using tea strainer and pour your sugar syrup in the lemon but if you don't want it too sweet you should not put all the sugar syrup. Then add plain water like 4-5 cup of water in it and add ur ice block.