How to Estimate Your Weekly 19L Water Bottle Requirements

Pearl Voda · 10 October 2026 · 5 min read

Step 1: Count what is actually used

Add up the daily use in litres across everyone who drinks from the dispenser. A rule of thumb many families use is about 2 litres of drinking water per person per day, then add cooking, tea and guests on top.

Step 2: Convert litres per day to bottles per week

The formula is litres per day × 7 ÷ 19. If the answer is 2.4, plan for 3 bottles so you do not run out.

Step 3: Check it against one real week

Estimates miss things. Start with a small batch, write down the day you open the first bottle and the day the last one finishes, and divide. If 3 bottles last 6 days, you use half a bottle a day, about 3.5 a week. You can use the 3 bottles free trial for this.

Step 4: Add a buffer for the season

Add one spare bottle in summer or when guests are coming, then drop back when things settle. Having one extra is better than a Sunday evening with an empty dispenser, since we do not deliver on Sundays.

Worked examples

• Family of 3, drinking only: 3 × 2 litres × 7 = 42 litres, so about 2 bottles a week.
• Shop with 6 staff: about 1 to 2 litres each per day over 6 working days is 36 to 72 litres, so about 2 to 4 bottles a week.
• Large household at 30 litres a day: about 11 bottles a week, which is where the weekly offer starts to make sense.

Step 5: Pick the plan

Once you have a weekly number, match it to a plan on the rates page, or read weekly vs monthly delivery. If you want a worked example for two common households, see how long one bottle lasts for 2 and 5 people.