Adding something acidic probably doesn't help, not in the stomach but in the liver ketamine is demethylated to norketamine. It happens a lot more due to first pass metabolism where much of the drug goes to the liver straight from the gastrointestinal tract via the portal vein, instead of going to the brain to act as with parenteral administration. Then, of course, everything eventually gets recirculated if not filtered out in the kidneys. Norket isn't really quite as psychoactive but it does produce a body high of sorts I think.
Only thing I can think of that something acidic or alkaline makes a difference with is at what point the pylorus passes on stomach contents to the intestines - that is regulated partially by pH apart from I think certain nutrient concentrations. Eating K on a full stomach definitely doesn't help absorption but possibly eating it with the right dissolved nutrients can convince the stomach port to wait a little before passing on the K.
You are right: oral and sublingual use would be the least efficient. With the related drug MXE I can do sublingual which is actually pretty great, but with ketamine the doses needed are higher. Still that should be a little better than oral but for it to be significantly better you would need to let it sit there under your tongue for quite some time which also does not seem ideal if you are very sensitive.
K is not actually a local anaesthetic so it won't necessarily numb the nerves where you apply it I think, but may still interrupt nervous signals and most of all may distort your proprioception. In my experience insufflation really isn't that bad as long as it's good material, and you really do have to crush it with say a bank card when it's microcrystalline otherwise it is rougher.
For very heavy use it's terrible on the nose, if you want a very effective trip / hole the best are still insufflation and aiming for strong enough effects that your nose feelings won't matter, or plugging it or intramuscular injection (this last one does not produce a rush like IV which I've never done but is apart from that one of the most effective ones. Quick comeup tho, few minutes.. Hardly more addictive than snorting it either IMO, but needle fetishes are a thing just like the ACT of smoking something is).
Methods for oral use? You just swallow some of course, whether dissolved in a liquid (fastest absorption I guess), or bombed in rizla or tissue paper or in capsules. Expect the experience to be more body oriented due to the norketamine which is produced even before the K starts acting, but levels increase similar to the hangovery feelings from acetaldehyde produced from alcohol. Also adjust your dosages. And expect the tail of the trip to be much longer since norketamine takes a LOT longer to clear from the body.
I would not make a habit out of this since the doses needed are significantly higher and the more you ingest regardless of the intensity of your trips, the harder it is on the bladder which can get scarred.
https://www.erowid.org/chemicals/ketamine/ketamine_dose.shtml
http://www.bluelight.org/vb/threads...with-the-Holey-Spirit?p=10204518#post10204518
http://www.bluelight.ru/vb/showthread.php?t=351462
Man, K is the greatest..
