the smallest bottles I found aer the 8 oz water bottles i can get eh larger ones. but i find it a pain to buy bottles all the tiem for them to chew uo. as for the tips it theonly size i know they came in.
I do place hteone hid under the water bottl to allow the rodents to climb up on them. ( I just finished cleannig the cages whe n Itoo tkhe pics so I had yet ot replace stuff were it goes )