Start by filling your glass with ice.
Pour 2 oz of rum into your glass by measuring it out with your jigger.
Pour 4 oz of soda water into your glass by measuring it out with your jigger.(note: if you want to just top the glass off with soda water instead of measuring it out that is fine also) Use your bar spoon to give your soda and rum a good stir.
(optional garnish) Add a Lemon, Lime or Orange wedge to the rim of the glass.To do this, just grab whichever fruit you choose, cut it into slices. Then, cut a notch in one slice either between the pulp and peel or just straight into the pulp. Use that notch to secure the wedge on the rim of the glass.If using spiced rum, lime and orange work best with the flavors.