Hoops could be used instead of glue of course.
With a conga shape you could get closer to an egg shape (amphoras where shape very closely to an egg shape as well), which is a very natural and beneficial shape for any natural process:
The egg shape represents natural harmony, life, birth, creation and potential. The egg shape preserves the energetic integrity of whatever objects or fluids are contained within it. Archaeological discoveries from Greece and Egypt have unearthed egg shaped containers used to store grain and seed. The 2,000-year-old grains from the Egyptian excavations have shown to still be viable! Greek amphorae are notoriously clumsy and difficult to transport, yet the ancients used this vessel shape (with a containment space structured like an elongated egg) to store olive oil, wine and other goods because the quality of contents could be maintained. This natural shape allows a consistent flow of energy to occur in fluids unhampered by the sharp angles of corners.
Conventional methods of water storage including rectangular plastics, cube shapes, giant cylindrical towers and standard cylinder bottles all contain sharp right angles which hinder the free flow of water’s energy. According to Austrian Water Wizard Viktor Schauberger, this stagnation is conducive to the formation of pathogenic bacteria and to water’s degeneration and loss of information. Schauberger observed this and discovered the best storage vessels were egg shaped.
Besides its shape, the material used in the construction of the egg is equally important. It has been determined that clay terracotta is the best material for water storage. Clay allows water to breathe and evaporate. This slight evaporation cools the water which then sinks down the walls of the egg and as it sinks, it forces water to rise up through the center and move out towards the walls. This process produces constant circulation and cooling, thus vitalizing the water.
Clay allows water to breathe and evaporate. This slight evaporation cools the water which then sinks down the walls of the egg and as it sinks, it forces water to rise up through the center and move out towards the walls. This process produces constant circulation and cooling, thus vitalizing the water.