Hi everyone - this is one of those posts where I'm going to teach your grandmother to suck eggs.
Brief background: graduated c25k, worked up to 10k, went back to improve 5k time, now working towards HM.
Anyway, I never had to carry water on a run before - the shorter run time o the 5k meant I didnt really need to think about in running fuelling.
One of the things I did notice in the early days of my c25k journey (the early days when you haven't yet bought any proper running gear in case you give up!) was that running holding a phone and/or keys in one hand was (1) quite distracting (2) unbalancing and lead to one arm tightening up through having to grip the whole run - i.e. not being relaxed, so I spent quite a lot of time researching/agonising over the best method of carrying water (this included considering planting unopened bottles at strategic points on the route!)
Anyway, I settled on the Kielder Ultimate Performance water bottle - I got mine from the ever reliable Amazon for £6.99.
The reason I chose this is because you don't actually need to hold it - that bit where the hand is through is like a sleeve with an elasticated band you tighten over the top.
The test in running included a reasonable effort to "fling" it off - pleased to say it remained in place, and once I got use to how the band felt around the hand, it didn't chaff or cause any holding/stress issues (this on a 90 minute, 13k run). I've got quite small hands by the way, not great big shovels, so if it works for me I would say it should work for nearly everyone.
Thought I'd let you all know in case you were looking for the same thing
Cheers everyone and have a great Bank Holiday Weekend!