How many 750 ml bottles needed for 1 gallon?

* Conversions:

* 1 gallon = 3.785 liters

* 1 liter = 1000 ml

* Calculations:

* 1 gallon = 3.785 liters * 1000 ml/liter = 3785 ml

* Number of 750 ml bottles needed = 3785 ml / 750 ml/bottle = 5.046 bottles

Since you can't have a fraction of a bottle, you would need 6 bottles of 750 ml to hold a full gallon.