You bet!One of the most common types of DIY Ollas is to glue two (same sized) unglazed terracotta plant pots together. A waterproof material (like a silicone caulk) is used to glue/seal the top rim of each pot together. If your bottom pot has a drainage hole, then it has to be sealed with a waterproof sealant so that water does not run out (or a cork, if you can find out that fits). The top pot also has to have a hole in it – this is where you add the water.After the glue/sealant dries, make sure that you fill your Olla up with water before you bury it into the ground. You’re checking for leaks.Next, dig a hole and bury it so that the inverted top pot with the open hole sticks out of the ground a few inches (the majority of the upper pot needs to be buried).The Olla can be filled with a garden hose, watering can, or whatever you have on hand. Be sure to put a cover over the water fill hole to keep out debris, bugs, mosquitoes, etc., and to prevent the water from evaporating from the fill hole.There are numerous YouTube videos on the subject of homebuilt Ollas. The one described above seems to be a ubiquitous theme, but there are many other design options to explore. Have fun!