bringing back is not a problem. the problem is when u are there.

dont be mistaken about the no liquid protocol. u are allowed to check in and only limit to 100ml for hand carry. liquid exceeding must be scanned unless u buy mineral water/liquor/wine, then it must be sealed in a see thru plastic type bag with the receipt in a smaller compartment in that see thru bag. i wish i took a pic for u but i tore mine up.
when u handcarry items such as cream/lighter/etcetcetc please declare em by revealing them in a plastic bag given to u upon check in.

dont la handcarry shampoo. for what ? check it in. bring lighter in your hand carry enough , thats if u smoke lol.
if u on international flight, they supply u water in airports and on flight so u have no reason to bring a bottle anyway. there's a water fountain near the smoking lounge in KLIA anyway. actually 2.