Can I just say it is dubious why someone would want to select a compound by it's shelflife although I can imagine you want to start sampling one of the wide range available and you don't see yourself eating a gram very soon.
Well now any major dude has already said it: most are suitable for your needs, minus 4-HO-tryptamines, and probably don't pick 4-AcO-tryptamines either (although they are better). 4/5-unsubstituted tryptamines are generally strong experiences and not handy to dissolve either, like DPT or AMT.
Tryptamines are wonderful compounds but if you want liquid measurement then phenethylamines are fine, probably start off with a 2C-X (any 2C)... at least half of them is easy to handle psychologically... one of the most gentle is 2C-D but it requires a larger dose and can be less interesting (IMO), then comes 2C-C and 2C-B both of which are great and good for beginners. Then comes 2C-I, then 2C-E or 2C-T-7. These latter two are the most interesting in my opinion but they can be a little overwhelming at times as well, on par with LSD.
Also remember two things:
- you can't safely use liquid measurement if you can't be sure of the amount you start with. If you order a gram of something there can be quite a significant error in what you actually get, it can be less but also a lot more.
If you insist on doing this anyway though start with half the starting dose you were going to try so that you can take a factor 2 inconsistency. But better yet invest in a milligram scale right away, they are not necessarily expensive at all, in fact they are cheaper than a gram of most drugs if you look in the right places.
- the shelf life of chemicals is not only dependent on the chemical itself but also on the solvent. If you use plain tap water then it can go stale / contaminate with germs pretty fast and that's not good at all to ingest. Use vodka instead to keep bacteria out, there is no problem in dissolving psychedelics in vodka, it is recommended as liquid measurement procedure. (anything over 20% alcohol is good, but I would not advise weak liquors with a lot of junk in it like fruit pulp - the purer the better, and vodka is little more than alcohol and water).
Good luck, and welcome on our site. I hope you will do a lot of research here to find a psychedelic that sounds like it suits you well, and encourage that you treat experimenting with them wisely. Psychedelics are physically relatively safe but still you will really thank yourself not fucking up with them.