Is pureed blueberry/strawberry in drinks ok?

[ralph.lasry]

Yes, so long as you have not seen any actual bugs in the fruits or vegetables.

See details here:

Blending Fresh and frozen unchecked vegetables

It is never permissible to eat any non kosher food. However when a non kosher food is blended and/or mixed into a mixture with kosher foods and has certain required conditions met it is nullified by the majority of kosher food and is therefore permissible. For the purpose of our question at hand, one of these conditions is that it not be intentionally nullified. For this reason if a certain vegetable type that requires checking (because it has been found to contain insects in the past) is blend…