I would talk to the actual caregiver feeding your child because if they dont have time to mix maybe you could mix. get a good feel for them. if they are lazy they wont do it right anyway.
I used pampered chef glass prep bowls w/ lids for mine... my DC used a crock pot filled w/ water to heat bottles and so they could just pop my food bowl in there as well to get it warmer... this was great b/c though I was doing purees in the beginning, I moved up to chunkier foods that I also provided (risotto, star pasta w/ ground meat, etc) and would have been a little gross cold.
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