How many 8 ounce glasses of water in 4 liters?

To convert liters to ounces, note that:
1 liter = 33.814 ounces

For 4 liters:

4 \times 33.814 = 135.256 \, \text{ounces}

Now, to find how many 8-ounce glasses are in 135.256 ounces:

135.256 \div 8 = 16.905 \, \text{glasses}

So, 4 liters is approximately 16.91 (or about 17) 8-ounce glasses of water.