[Solved] Best Methods and Adapters for Recycling Sink Water into Toilet Flushing System

In post #17, I calculated the daily cost of flushing the toilet for an entire family of 4 at PLN 1.20. That's half a so-so beer, a little more than a cigarette or the equivalent of the smallest Price Polo wafer.
Maybe for some families PLN 1.20 a day is money, but this solution itself - and others - whatever it is, is absolutely no technical hit, and to put it bluntly: it requires covering with a blanket or a cupboard, because it is a nightmare. Therefore, I consider the smacking of delight to be unjustified.
This siphon, as well as the cistern itself, as some of my colleagues write, will start to stink more than an unflushed toilet; then perhaps a better and more economical solution will be not to flush it, or to turn it off and take care of your physiological needs at gas stations.