Hi, my son had colic... it was called 3 month colic then and he had it from a couple of weeks old until he was about 5 months (I think). He did have gripe water but not when he was very tiny... cant remember what age you can use it from. It was 10 years ago so things may have changed. I also found giving him his feed earlier helped as he was a bit of a gulper... so if dinner came early he didn't gulp so much and it helped.
he also liked having his back rubbed... he would lay on my lap in his tummy and i would rub his back... as he got older as a toddler he would still wander over, pull his top up and lay over my lap waiting for his backrub... at 10, when he's tired he still likes to sit beside me on the sofa and get me to tickle his back... although I find it a bit tedious now!
the colic was a really dreaful time as he was clearly very very distressed and I can still remember how helpless I felt... hope your friend finds and answer