I have beentrying to make a visual gage to see how much water is being used in the Ollas. I think this will work well. For sure the two quart Mason jar works best. You might also try a 2
liter soda bottle . The ones I tried were not strong enough and the
weight of the water cause them to collapse. Our garden is flourishing
with the subsoil watering of the Ollas. A two quart Mason jar fits very nicely on the top of Olla. In the top right picture I use a glass milk jug, but does not seal as well as the jar. The lid of the jar makes for a little bit of shade to keep the water cooler. I also use a kitchen towel over the top of the jar for additional shade.
The next step is to add a long stick bobber floating inside (not shown) that will show the level of the water once it is below the rim of the olla. The 2 quart jar and at least a day or 2 of moisture before I have to fill the olla again.
Permaculture and Polyculture Consulting and Design
Getting to know your property, the plants you have and those you can grow, is a fulfilling endeavor. With most I am the steward of the land. I give them good soil biology and they do the rest. If I group them in cohesive plant communities, they respond with greater yields. If I encourage the micro-organisms (Fungus and bacteria) , the roots obsorb more nutrients making a pest and disease resistant plant. A stronger plant that gives us more organic food and takes less energy.