Terracotta pots drying out

I find the soil in unglazed terracotta pots dry out quicker than glazed pots. Which is fine for growing herbs, just not other plants. However, I found a bargain at the garden centre today for £5 and couldn’t resist. I’m going to plant some wild strawberries in it.

The pot only has a light glaze to it. Would it be ok for me to line the inside with some plastic or would the plastic eventually leech into the soil? Is there an alternative to retaining moisture in terracotta pots?
I’ve also tried the gel retaining stuff in the past, without any luck. My garden gets pretty much full sun most of the day.

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"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
I like the algae/moss which grows on the pots, but I know others don't. Difficult to avoid it here too.
Mind you, if I stand still too long, I get a 'patina of algae' an' all...
I live in west central Scotland - not where that photo is...
"We don't stop playing because we grow old; we grow old because we stop playing." - George Bernard Shaw
Thanks for the tip Obeixx. I do have a large terracotta pot that has been flaking so much, I dare not move case it crumbles away! No problems yet on the terracotta herb planter which was purchased around the same time.