Depends, we generally take a small Johnson's Baby Powder, a few washing up tablets, toothbrushes, our own cologne/perfume, after shave balm, Imperial Leather foam shower gel and maybe a few other smaller items.
Hair shampoo/conditioner, sun lotion and heavier items we buy out there.
I do the same, except I do take the shampoo, etc. I dont mind the extra weight on the way there, but I leave them there so I don't have the extra weight on the way back. I also take washing up liquid decanted into a small container that seals properly for washing refillable mugs in the room as we stay onsite. However I make sure that I have half full bottles when I leave, knowing I won't bring them back with me. I prefer my own brands.
I generally take my own but just leave it out there once done!
I'm one of these fussy people who likes to use the same shampoo/condition etc. all the time.