I'd fill any bottles with electrolyte. No point doing one electrolyte and one water, may as well do both electrolyte.
500ml would leave me quite dehydrated by the end of 26.2m. I can do a half with just pre-hydration and 30km is about the limit of what I'll do without having more than 500ml. (For longer runs I use my bike as a base and stash more liquid and gels/snacks so I can top up part way through a run). If this wasn't viable I'd just use a hydration backpack, even if I ignored the bladder and just stuck an extra 500ml bottle in it).
If you really don't want to carry gels or too much water in your hands then either take the camelbak, use a waist pack, or plan a quick stop in a shop for more water and a snack.
Dehydration will ruin a run, especially at the point where you'll need everything to be going well in order to continue (past the magic 20 mile mark).
I use one of these:-
http://www.wiggle.co.uk/ultimate-performance-kielder-handheld-bottle-carrier/
easier to carry than one of those bottles and also carries 500ml. There are a few different ways to hold it to vary the irritation over the length of the run.
Or just get a bigger hand bottle: http://www.wiggle.co.uk/ultimate-performance-runners-bottle-580cc/
I'd fill any bottles with electrolyte. No point doing one electrolyte and one water, may as well do both electrolyte.
500ml would leave me quite dehydrated by the end of 26.2m. I can do a half with just pre-hydration and 30km is about the limit of what I'll do without having more than 500ml. (For longer runs I use my bike as a base and stash more liquid and gels/snacks so I can top up part way through a run). If this wasn't viable I'd just use a hydration backpack, even if I ignored the bladder and just stuck an extra 500ml bottle in it).
Not sure why gels are a big no no for you, but I'd also carry 3 or 4 Isogels (e.g. http://www.wiggle.co.uk/high5-isogel-sachets-25-x-60g/ - they contain more water than normal gels so they're a lot easier to take).
If you really don't want to carry gels or too much water in your hands then either take the camelbak, use a waist pack, or plan a quick stop in a shop for more water and a snack.
Dehydration will ruin a run, especially at the point where you'll need everything to be going well in order to continue (past the magic 20 mile mark).