Extra water for a pet, on top of the people
Ready.gov lists pet water on its own line, so add what the animal already drinks on top of the people gallon. The trick is to store water you would actually let them drink on a normal Tuesday.
You already know how often you fill the bowl, and that number is the starting point. Ready.gov puts pet water on its own line for a reason, because the animal's daily intake sits on top of the one gallon per person per day that humans need. If your dog laps through a quart bowl twice a day, that is half a gallon just for the dog, every day, on top of everyone in the house. The simplest way to plan is to take the water you would let them drink on a normal Tuesday and pour that into the same containers you trust for the people.
A puddle and a filter is a later problem. Right now, the job is to cover the everyday drinking volume so you are not rationing between the family and the animal. Do this today: write the pet's normal daily water on a piece of tape and stick it to the jug, so anyone in the house can see the number without guessing. That single label turns a vague plan into a real count you can check against the shelf.
Check today's price on Amazon for the jug we use for the people, because the pet water is just more of the same container.
Reliance
Reliance Aqua-Tainer 7 Gallon
Today's price is on Amazon
Same jug as the people. The extra water is just more of it.
Check today's price on AmazonHow many gallons for one person at home is the human number, and once that is covered, the pet sits on top of it. If you might have to carry water to a shelter or a vehicle, that is when a filter earns its place, and the next guide walks through picking between the two common options.
Your next read is Sawyer MINI or LifeStraw: pick the job, then the filter. When you are ready to compare gear, open the See the water we would buy first.
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