The Spring Water rate is $\displaystyle\frac{{\text{\$}{1.76}}}{{{16}\ \text{ ounces}}}=\frac{{\text{\$}{0.11}}}{{{1}\ \text{ ounces}}}\usepackage{cmbright}\Huge\$

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