Which of these fits gap 24?

Directions: Complete this passage by selecting the most suitable option for the corresponding gap.

”Water, water everywhere, not a drop to drink” The problem faced in the middle of the sea by a ___(21)_____ sailor, troubles us regularly in our daily lives. Life cannot _____(22)______ without water, and we get thirsty without drinking it.______(23)_____, natural water, or that from faulty supplies, may carry harmful substances or bacteria. They pollute or damage the purity of water, and sicken our body. That is why, it is always very important to make sure while drinking, that the glasses are clean, and the water is____(24)_____ to drink.