What worked for me is to settle on a generic filler item. Personally I use toothpaste. Costs a decent amount, can be stored for a long time, doesn't need much s

What worked for me is to settle on a generic filler item. Personally I use toothpaste. Costs a decent amount, can be stored for a long time, doesn't need much space and I'll need it eventually. This way I don't go looking around randomly but just always fill the gap with that item.