OK, let's do the math:
13,000 baht = 20,000 liters at 1.5 liter per baht.
20,000 liters = 3,333 6 liter bottles.
Let's assume 10 bottles filled per hour, that's 240 bottles per day, that's no service for 13 days.
I can't believe the daily average would be more than 200-300 bottles per day.