Add all the ingredients except the fruit to a glass container that has a tight fitting lid. Stir well and screw on the lid. Refrigerate overnight.
Remove the lid and stir again. Layer the oats with the berries in a glass or bowl and enjoy.
Notes
Use a 2 : 1 ratio of liquid to oats. You want to make sure you have enough liquid for the oats to soften, otherwise it's like eating paper. Not what you want first thing in the morning!
Don't use instant oats! Thet are processed to cook quickly and because overnight oats take ... overnight ... instant oats all but completely dissolve into nothing by the time breakfast rolls around. Old fashioned oats are the preferred variety for this method.
Wait until morning to add the fruit. Like the instant oats, fruit breaks down quickly and will leave you with a mushy mess. It's best to add fresh fruit at breakfast time