Hey guys,

Many people search for these day and night, to find the codes for multiplayer or singleplayer commands to spawn them in, well, here they are!

Swiftness:
Mark 1: 373:8194
Mark 2: 373:8226
------------------------
Splash 1: 373:16418
Splash 2: 373:16386

Strength:
Mark 1: 373:8265
Mark 2: 373:8233
------------------------
Splash 1: 373:16425
Splash 2: 373:16457

Instant Health:
Mark 1: 373:8197
Mark 2: 373:8229
------------------------
Splash 1: 373:16389
Splash 2: 373:16421

Regeneration:
Mark 1: 373:8257
Mark 2: 373:16471
------------------------
Splash 1: 373:16471
Splash 2: 373:16449

Fire Resistance:
Mark 1: 373:8193
Mark 2: 373:8225
------------------------
Splash 1: 373:16387
Splash 2: 373:16451
---------------------------------------------------------------------
Slowness:
Mark 1: 373:8202
Mark 2: 373:8266
------------------------
Splash 1: 373:16394
Splash 2: 373:16458

Harming:
Mark 1: 373:8204
Mark 2: 373:8236
------------------------
Splash 1: 373:16396
Splash 2: 373:16428

Weakness:
Mark 1: 373:8200
Mark 2: 373:8264
------------------------
Splash 1: 373:16392
Splash 2: 373:16456

Poison:
Mark 1: 373:8228
Mark 2: 373:8260
------------------------
Splash 1: 373:16420
Splash 2: 373:16452

--------------------------------------------------------------
Water Bottle:
Mark 1: 373

Awkward:
Mark 1: 373:16

Thick:
Mark 1: 373:32

Mundane
Mark 1: 373:64

Empty:
Mark 1: 374
----------------------------------------------
Bottle O' Enchanting:
Mark 1: 384

Hope it helped :)