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You might be surprised to know that plants lose water from their leaves and as your plants, with the exception of cranberries, are deciduous (lose their leaves in winter) they won't be losing any moisture.
Also their roots won't be growing, so if you planted bare root plants they won't be able to pick up any water until their roots grow.
Therefore assuming that you planted in the approved way in moist soil and firmed the soil to make sure there was good contact between root ball and soil there should be no need to water until the foliage grows, which generally happens in spring ( March/April in the British Isles). Roots will begin to grow at this time too. Thereafter you would be wise to water in dry spells for the next two summers.
Cranberries are evergreen (don't lose their leaves in winter) and therefore can lose moisture. However because the weather in winter is cold and nights long, little water is in fact lost, so again watering is unlikely to be required.
If the soil has frozen around your cranberries, moisture will be unavailable to plants and they will in effect be vulnerable to drying out if the wind picks up. You can avoid this by protecting the plants with a cloche, double later of fleece or digging them up and keeping in pots in a greenhouse or similar until spring.
You might have planted your fruit in containers - the same applies but the potting medium is more likely to freeze, so group the pots together for mutual protection. If you can put the pots in a shed so much the better - in future winters the pots can be left out as the roots will be acclimatised to freezing. Potted cranberries could have the pot wrapped in bubblewrap to prevent freezing of the potting media, but bringing into shelter would be best.
As there is no need to water your blueberries there is no need to add anything to your water supply. In summer you should water with rain water from your water butt. However any water is better than no water and in the absence of sensible additive for gardeners, just apply tap water when the water butt runs dry. If you have an acid soil it will be fine, if you don't have an acid soil the blueberries might not thrive anyway and you will have to consider pot cultivation.
Boggy
Beware the bat-eared bogweevil
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