HELP SOMEONE...Folic Acid????????????????

......................................................................So i wanted to add folic acid pills to my ttc, I'm already taking Geritol and want to add pink stork tea, but I'm so confused on what brand of pills to buy and where to but them at?? & how many am i supposed to take?? Also can I take them together with geritol or should I take Geritol In morning and folic acid pill(s) at night???? I'm so confused...

*WHERE SHOULD I GET SOME FOLIC ACID PILLS? AND HOW MANY SHOULD I TAKE? T.I.A.