Tell me how I can transport a 42 litre flexible bucket?!
Tie some straps to it and wear it like a rucsac.
You should be able to get most of that in a pair of rear panniers, failing that there's a trailer, but some can cost nearly as much as your bike, so you need to ask yourself how often it would get used.
Kickstand is not necessary but it is bloody useful, especially when loading panniers.
I hold one pannier between my legs whilst rummaging in the other, not other means of support necessary. I wouldn't touch a kickstand with a bargepole, they're too narrow base and prone to toppling.
I've come across numerous times such as stopping to take photos where it would have come in use. I would have had to lay my bike down in the wet mud.
If the ground is soft & muddy a kickstand will be as much use as a chocolate teapot, the bike will fall as the tip will sinks into the mud.
I'm not going to lean it against the corner of the brick wall which will scratch the paint.
I've been leaning my bike against walls & fences for 23 years and there's not a scratch on it, that's because I don't lean it on the paintwork. To park the bike without it falling or rolling you need four points of contact: two wheels, handlebar, and either saddle or pannier. Avoid hills, but if there's a slight incline park it pointing uphill so that it's trying to roll toward the wall, not away from it.
this is the best video I've seen on fitting a tyre
I'm 65, and I've never yet had a tyre that difficult to fit.