The Spring Water rate is: $\displaystyle\frac{{\text{\$}{2.08}}}{{{16}\ \text{ ounces}}}=\frac{{\text{\$}{0.13}}}{{{1}\ \text{ ounce}}}\usepackage{cmbright}\Huge\$

The Fresh Water rate is: $\displaystyle\frac{{\text{\$}{2.40}}}{{{20}\ \text{ ounces}}}=\frac{{\text{\$}{0.12}}}{{{1}\ \text{ ounce}}}\usepackage{cmbright}\Huge\$