Hmmm...perhaps not so much liking 'acid soil' as more of 'preferring soil being on the acid side from the neutral'....they will still perform even if the soil is slightly alkaline too.
I would think of coffee grounds as much as tea being more of soil conditioner that will help to keep soil acidity rather than able to change the soil ph....unless you get it in huge quantities, but then you would not able to grow much in it until it rots down.
If your soil is very alkaline...I would look into first improving it to more of strawberries liking and then thinking of 'how to keep it in that condition'.
Perhaps buying in few bags of 'lime free topsoil' to give 'body' and mixing in some peat and/or peat substitute for humus that strawberries will readily deplete from the soil while they occupy the space. Then mulching the strawberry bed with coffee/tea ground as and when you have some available. Chopped up bracken (composted or fresh) will work wonders too...you can use fresh as substitute for straw and it will all eventually rot down and helping to keep acidity up and provide humus too
You are not really looking to create true ericaceous conditions. If raspberries do in your soil...strawberries should do too without going to any extra hassle