For ready made solutions - I bought a pack of Dixie Drops from Clwt Twt (if you google it you'll find it!). I make up the solution and then put it in a spray bottle - last for ages, in fact I've only bought one pack and dd is nearly 2.
I do a Baby Botty Mix that can be used for wipes but can't advertise myself...but it's available from Treehuggaz as well.
We used them out & about as well as at home and I found it v easy - just shoved a pile of them in the bag along with the spray bottle.
You can always just use cooled chamomile tea.
If you prefer to soak the wipes before going out you can buy a small wet bag (I found on in Superdrug for about £1.50 intended to be a wash bag) and shove them in that until you use them when you're out.