A little more than 2.
15 gallons contains ~76 750ml measures.
There are approximately 30.28 750ml bottles in 20 gallons of liquid.
600 bottles
Twelve. 750ml X 12 = 9000ml (1L = 1000ml)
One standard bottle.
Four.
either 6 or 12 if they are standard 750ml bottles.
175L
five bottles. You'll also have at least 250ml left over to fill from a sixth bottle, and given that a 750ml wine bottle won't be completely full, you can estimate that actually about half (375ml) the sixth bottle can be poured into the 4l vat or container, given an average of 725ml in a 750m bottle (allowing for corks and margins of error.
Gentleman Jack typically comes in 750ml bottles.
Just over 5 A single 750ml bottle contains .198 gallons. Therefore you'd need 5.1 bottles to make a gallon.
There are many different water bottles. The commonest have 500 ml of water, but some have 750ml, or 1 litre