The "plain old fashioned" kind you describe is the most gratifying for me, so much so that I'll say to the exclusion of the more exotic equipment and solutions. I'm not into discovering my personal best on volume, or trying to up the bar on nozzle diameter; it is in no way a contest, as I see it for myself. I've covered this in earlier posts, but I'll say it here again: I was introduced to enema play by my ex-wife, who in turn had met an older woman workmate who eventually became her "guru of the bedroom", so to speak. The older woman acquainted her with a number of kinky new activities to liven up what had become something of a rote routine for us. Enema play, with a definite dominant/submissive dimension to it, quickly became our hands down favorite. No cuffs, chains, masks or whips -- just the "ex" in tight jeans, high heels and cashmere sweater (braless), strutting with attitude and authority, demanding my obedience.
After our "entry level" red-stoppered bag, which she bought in haste, we upgraded to a 2-quart amber latex version -- call it high-end drugstore, which it was at the time. I retrofitted amber latex tubing shortly after buying and trying it, mainly because we needed extra length -- 8 feet, to go from closet hook to bed, with a good amount of slack remaining -- and because it resisted kinking so much better than the original hose. This longer hose with smaller inside diameter also slowed the flow rate, eliminating the need to fiddle around throttling the clamp, or to add a second pinched-down clamp, which was a plus. We used the original straight white plastic nozzle for some time, but eventually found a black nozzle of the vintage "stretched teardrop" shape in a neighborhood pharmacy while on a trip to Virginia; it has slightly less than 3 inches of usable length, and became our permanent choice after the first use -- sphincter-friendly insertion, and it somehow seems to say "enema" much more emphatically than the straight white one that came with the bag.
The other piece of basic equipment, which came sometime later, is an "adult rectal syringe". These are all but impossible to find in retail pharmacies, at least here in California, and were not easy to find even in the 1980s and '90s. After searching small independent drugstores, we eventually found an 8-ounce bulb in white with white nozzle. Then, in the same Virginia store in which we found the "Teardrop" nozzle, we found a 6-ounce bulb, still labeled adult; we bought it, of course, and my "ex" found it easier to use than the 8-ounce. To a receiver who savors the many nuanced sensations of an enema given slowly, for erotic pleasure, one given with a bulb can be a markedly different experience than one given with the more convenient bag. I covered my take on the differences in an earlier post, so to keep this from getting way too long, I'll move on without repeating myself.
To my taste, there's simply no reason to experiment beyond the classic solution of Ivory in warm water -- made on the rich side, of course. My "ex" had the making of the solution down to a tight formula: 3 quarts of water, a few degrees above administering temperature when run from the tap, to allow for cooling as it was transferred from bowl to pitcher, bag or bulb. The solution was then completed with 40 rotations of an Ivory bar in her immersed hand. The finished product was very cloudy, almost pure white -- and effused that unique and intoxicating scent! As for volume given, she nearly always got started on the third quart, but very rarely finished it -- I was a 2-1/2 quart patient, pretty consistently. A year or a little more after the "ex" and I parted, I met a nurse (female) who was -- and I say this in a wholly positive sense -- obsessed with anal sex, enemas included. She insisted on using liquid castile soap that she had in little packets. It didn't excite the fetish as Ivory did, but there was no talking her out of it and into the tried-and-true fragrant white bar. Still, her enemas were incredibly good, and more than that, she was as avid about receiving as she was giving -- something my "ex" was not, in large part because it would have upset the dom/sub order that was established at the very beginning.
Summed up, if I'm to be the receiver, no need to spend money on strange nozzles of uncivilized diameter. And the wine and coffee can be saved for enjoying in the mouth; likewise, table salt. Epsom salts, reserve for the bathtub. All I need for a few hours of ecstasy are a good bag or bulb, a bar of Ivory and a jar of Vaseline. That, and of course, an engaged and practiced giver!