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If you can imagine your entire garden submerged under two inches of water, that's probably the most accurate way of looking at it. That's (estimated) how much your entire garden area needs per week.

Here's a page from The University of California's Gardening co-op Extension showing some visual references and a couple of formulas for raised and other types of gardens:

http://ucanr.edu/sites/scmg/files/185639.pdf

NC State University's co-op extension has some good tips on checking moisture levels manually:

https://pender.ces.ncsu.edu/2013/08/how-to-water-vegetables-and-herbs/

You don't need to water the clematis through the winter if you prepare it properly. It will "sleep" until the temperature warms again, and the freeze-thaw-freeze cycles of winter will actually kill the plant if there's water in the root system. There are some steps you'll need to take to prepare it for its winter sleep, and this article will walk you through those: https://www.gardeningknowhow.com/ornamental/vines/clematis/clematis-winter-preparation.htm

Same with your Hydrangea. This article will give you some tips to prepare the Hydrangea plant for winter: https://www.gardeningknowhow.com/ornamental/shrubs/hydrangea/hydrangea-winter-care-how-to-protect-hydrangeas-from-winter-cold-and-wind.htm

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Depending on the type of plant that you have and the soil mix, you will need to actually check the soil to determine if it is over or under watering issues.

If the soil is dry or excessively wet, the water nanny is not working for this particular application.

Can you give us more information on the type of plant that you have.
Curling leaves can indicate pests or disease.

Here is a link with information on making your own foliar spray.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/calcium-fertilizer.htm

This article will help you.

https://www.gardeningknowhow.com/ornamental/trees/tgen/watering-newly-planted-tree.htm

Community Garden plots often provide hoses and watering cans right on site for the gardeners to use.
Chat with some of your fellow gardeners to inquire the best method and how to use the garden properly.
Perhaps they have a schedule, and many times a fellow gardener may even share watering tasks with you!

https://www.gardeningknowhow.com/edible/vegetables/vgen/water-plants-vegetable-garden.htm