Final answer:
Approximately 700 million people are currently facing water shortages, and it is estimated that over half of the global population will be facing water scarcity by 2050.
Step-by-step explanation:
The answer to the first part of your question is that 700 million people across the globe are currently facing severe water shortages. As for the second part of your question, it is difficult to give an exact number, but several sources estimate that by 2050, more than half of the world's population will be facing water shortage. This means that the number of countries facing water scarcity could potentially be over 100.