Here’s a very simple shrine. In the beginners class for Kemetic Orthodoxy (House of Netjer), they suggest that you start out by doing a simple rite dedicated to Netjer (all the Gods and Goddesses), and not use an icon. This one makes use of flame (candle on a soapstone plate), incense (the little bowl to the right with stick incense stuck in sand or something else to hold it, a container to hold the water for the libations, and the container to pour it into.
You could use a placemat for the altar cloth. The whole set-up cost less than $5, I think, with some judicious thrift store purchases. I prefer using my little oil lamp, so I “borrowed” the candle for illustration.
