Happyisland there where few discussions here how to reduce waste.
I will summarize - you need to have 1- clean thinner; 1- jar for cleaning; 1 bottle to collect waste.
let bottle with waste to sit down for couple of days - paint will segregate and on top you will get quite clean thinner that you can carefully pour back in the cleaning jar.
when bottle to collect waste is full of residue paint and it will take a long time you can take it to proper disposal.
make sure that lids are tightly closed as paint thinner has some bad effects on health and flammable as well. This will prevent evaporation.
If you paint every 2 days that often you may need to have two bottles for contaminated solvent and rotate them on weekly base.