For years we've been storing leftover food and drinks in wide mouth mason jars sealed with plastic caps. It's inexpensive and convenient. A 12-pack of Ball 16oz Wide Mouth Mason Jars costs $8.47 on Amazon and an 8-pack of Ball Wide-Mouth Plastic Storage Caps costs $5.32. So,each container cost about $1.40.
Carla stores cold brew coffee in them. When its time to drink one, she adds a slight halfs and half, or stirs it up and it's alert to consume.
Source: boingboing.net