advice needed on dr brown bottles

hi,i feel a bit checky asking for your advice as i havnt been on here for ages last time was on the pregancy forum.i would like some advice on dr brown bottles as i have just brought some of ebay not sure what teat size i will need the ones i have brought are size 1 and some size 2.i am using nuk bottles now and you have to use diff size teat for water do you have to do the same with these?ive tried looking on the website but no joy,it will prob say on the packet but im hopeing they are going to come tommorow morning and would like to use them straight away as my daughter suffers with collic hense why i havnt been on this forum yet.thanks,mem.