If you know how to purify water, then even the dirtiest of ponds can provide you with a lifeline of potable (drinking) water, ensuring your survival and those you are responsible for.
Godu uzokubona ukuthi 'ungabuthumela njani uburotho bakho phezu kwamanzi,' bonyana usize labo abangakasabeli eqinisweni. - Mtj.