Ilford in its time has had many such 'quick use' kits. I recall, in the 1980s, a 'Universal' kit which I believe could be used for both films and paper processing. If memory serves me right, the developer was PQ Universal which I found wasn't the best for most films, so I bought two kits and then went back to my own home processing technique (which IIRC involved ID11 - I now use Kodak D76 as it's more easily available and somewhat cheaper to buy in Australia and Asia).
This 'simplicity' (whoever says film processing is "simple" is guilty of hope over experience) kit I would never use at home for my processing as I have a makeshift permanent darkroom with ample space for chemistry and a large fridge to keep all my mixed solutions nice and cold. On the road, well, it could be useful - but I never process when I'm away, preferring to hoard my films and tackle them when I eventually return home for some R&R.
It may be just me, but I've never been able to keep concentrated Ilfosol 3 for any period of time. Even unmixed. It seems to deteriorate quickly. So I've avoided buying it. ID11, D76, home brewed Thornton's two bath (the AA mix) suit me just as well. Refrigerated, all these mixed developer (stock) keeps indefinitely. When travelling I would tend to process and dump anyway, so longevity isn't an issue. (Yes, I did say I never process when I'm away, so this is an "in principle" comment.)
The Ilford quick washing technique (evolved after much practice to my own, essentially similar to David Allen's) I've made use of since the 1980s. My negatives from that era remain in pristine condition with absolutely no fading, so I'm satisfied that it works. Kudos to Ilford and to Dave for their positive input into our processing successes.
I've also used distilled water as a final rinse for many years. I buy a one liter bottle of it (for +/-A$1.50, going by the price tag on the last bottle I purchased at our local supermarket), mix it with Photo Flo, and use it for three months. In-between processing sessions it rests safely in the fridge. I make sure to check it for 'deterioration' before each processing session. So far, entirely good. It's a small expense (I've had the Photo Flo concentrate bottle since around 2003 and it's still far from empty) for consistently good drying results.
Overall, good info in these posts. We need more of these threads.