Towpaths and punctures.

5°C, lighter, calm.
Unwanted side-effect, punctures. Just patched the tube that went down yesterday, it had two holes and needed two patches. One was a snakebite, probably from the moment the nail punctured and pinched the rim against the road. It’s not so obvious that the tyre is going soft on soft round.
In the meantime, both tyres on the bike have gone soft overnight.. At least two more punctures!
That averages out at nearly two per ride. Sigh.
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Tyre liners, change tyres or some of that goo that seals from the inside? What’s the best idea?