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Bowls & Water Bottles · H2O4K9 Water Bottle

H2O4K9 Dog Water Bottle: Specs, Capacity & Alternatives

Research Review Compiled from verified sources — not hands-on. Last verified July 24, 2026

By Maya · Gear Research & Sizing Editor

The H2O4K9 is a stainless steel water bottle built specifically for sharing water with a dog on the trail. The defining feature is a screw-on lid that detaches to become a small drinking bowl (~8 oz), so you carry one bottle and pour into the lid for the dog rather than squeezing or tilting a human bottle. The bottle itself holds about 25 oz (700 ml).

H2O4K9 Water Bottle
Photo: H2O4K9

$17.99

Last checked July 30, 2026 at Ray Allen — source . Price may have changed; confirm at checkout.

Sold by H2O4K9 · reader-supported links

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Best suited for

  • Day hikes and travel where you want one stainless bottle that serves both you and the dog
  • Owners who prefer pouring into a bowl over tilting a bottle into the dog's mouth

Poor fit for

  • Owners who want a squeeze-bottle roller-ball style dispenser instead of a separate bowl

Pros

  • Stainless steel construction is durable and keeps water cool longer than plastic
  • Screw-on lid doubles as an ~8 oz drinking bowl shaped for dogs, per H2O4K9
  • Single bottle for handler and dog on a day hike

Cons

  • A two-piece lid-bowl means a part to keep track of, unlike a one-piece squeeze bottle
  • Heavier than a collapsible silicone bowl used with a separate bottle

The mechanic is the whole product: the screw-on lid comes off and becomes the dog’s bowl. You pour from the 25 oz stainless bottle into the ~8 oz lid, the dog drinks from something shaped for a dog rather than a tilted human bottle, and you drink from the bottle itself. One vessel, two drinkers, and stainless steel that keeps water cooler than plastic through a day hike.

The tradeoffs are the flip side of the design. The lid-bowl is a separate piece, so it is one more thing to keep track of at a trailhead; a one-piece squeeze bottle cannot lose a lid. It is also heavier than the bowl-plus-bottle-you-already-own approach — this is the pick for people who want the single-object system, not the lightest kit.

H2O4K9 positions it for day hikes, travel, and outings where one bottle serves handler and dog. A note on sourcing for this page: distributor and retailer listings are the primary documentation, with no single authoritative manufacturer spec sheet, so our confidence is a notch lower than on manufacturer-primary pages — the numbers above (~25 oz bottle, ~8 oz bowl) are consistent across the listings we checked.

Verified specifications

Brand
H2O4K9
Model
Water Bottle
Materials
Stainless steel bottle, Screw-on lid that doubles as a drinking bowl
Sizes
~25 oz (700 ml) stainless bottle; lid/bowl holds ~8 oz

Sizing & compatibility

~25 oz (700 ml) stainless bottle; lid/bowl holds ~8 oz

Fit depends on your dog's measurements. Measure girth (the widest part of the ribcage) and consult the manufacturer's size chart before buying — a poor fit can cause chafing or let an escape-prone dog back out of the harness.

Comparable alternatives

Related reading

Sources & research

Read our research methodology and editorial standards →

Research confidence: 82%