oooo..this is something which really worries the girls mostly..i went to redang last month...and i didnt expect mine to come during the trip...fortunately, it came few hours after i reach home on the last day...

you can try to go pharmacy like guardian, tell the pharmacist, you going on vacation soon but wanted to delay the period timing, they will ask you whether you are pregnant or not coz this is a NO NO for those who are, and the last time i bought, the pill is called "pregnan"..without the capital T. Its also a hormone pill which delays ur period cycle and its not cheap either..

but yeah, its true ...period doesnt leak when you are in water.. ..i agree with other girls mention...do wear tampon to be safe..