Until you have a full stack of jars, I liked having empties. The second I had a full stack they became annoying.
Empty jars/food cans get annoying quickly when you are looting and that becomes an additional thing to manage.
Knowing I generate 3 water a day per dew collector while I can focus on anything else I might want to do is really satisfying. If you have 2 or 3 dew collectors per person, you never run out of water.
Jars and cans just become useless once you get past week 1 in my opinion. After week one they are more of a nuisance than a benefit.