Left: I opened a sealed roll of a filament purchased in 2018 and I printed that rose
Right: I dried that filament in the creality dryer overnight and sent the print again
This pic was taken on 10th April. After drying the filament I put it back in storage and I forgot about it until it exploded today
There are probably cheaper bulk options–but I personally bought some 50g satchets that change color when they start to saturate, for convenience. 3 of those keep a large bin dry for a few months depending on ambient humidity and how often you open it.