An Olla will provide water outwards a distance about the same as it's diameter, or more with larger Ollas.  Often a single Olla planted between 2, or in the center of 5 or 6 plants is sufficient.  Contact me with what you plan to plant, and I can help you figure out optimal spacing.

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Some of the plants that love Ollas

Tomatoes
Herbs
Lettuce & other salad greens
Spinach
Kale
Herbs
Cucumbers
Squash
Melons
Peppers
Peas
Beans
Potatoes
Corn

A few plants that don't love Ollas

Carrots
Beets
Onions
Garlic
Radishes
Plants that have a taproot (one root system)

My Ollas hold 1.25 gallons, although I make many shapes and sizes.  Contact me with questions, or check out my Ollas (or other pottery!) at www.onewintrynight.etsy.com