These issues primarily center around my own experiences, so it may vary between people as experiences obviously differ from person to person.

These issues mainly center around two commodities: Water and guns (primarily rifles).

Water:
Water is a highly sought after commodity for many reasons, but for those same reasons, it's difficult to acquire, and why? Many of those who sell the commodity are difficult to get a hold of, furthermore there are very few people who are online regularly enough to sell it to those in need. Personally, there is only one person I've found that is online at least every day that I can get to for water if I'm online when they are.
Solution?
I see a solution that can help this is a way to get water from other sources, such as from a river or pond (or other alternative sources), but having a way to filter the water, such as water purification tablets or a hanging charcoal-based filter with a plastic bag. It would be an extra commodity,but something that can go along with a commodity of 'unfiltered water', then using it will turn it into filtered water, or something along those lines. It can probably ease the stress of searching for someone as your health drains from dehydration.

Rifles:
As far as I'm informed there is only one (1) person on the entirely of the sim that can sell rifles, and I see this as an issue since the person doesn't seem to be on often enough for players to seek out the commodity in a timely fashion, relying on simple luck to find this person.
Solution?
I see the best solution for this is to simply have more than a single person having the ability to sell rifles, expand it to three people at least, this would make it easier for someone to make a purchase for the commodity instead of spending weeks trying to find this one, single person to get a rifle (and I can only assume it's the same issue with rifle ammo).

And as for a personal issue, I'm getting absolutely zero loot from killing zombies, is it only me having this issue, or are others having this issue as well?

I love the sim, I really do, it's fun to RP in and the community is very open, but things are difficult with the above stated issues when it comes to the specific commodities I listed.

Thank you for reading.