Floating frozen water bottles in tank

[LeahK]

Hi! This may be a silly question, but I've read several people on other threads saying that they float frozen water bottles in their tanks to keep them cool. I'd like to do this, but I can't find a water or soda bottle that doesn't have a sticky label. I don't want to use soap to scrub off the glue, but I'm worried that if I just use hot water, traces of glue might remain on the bottle.
I bought a few blank travel-size plastic bottles from the drugstore, but these are so small that they thaw pretty quickly and don't affect the tank's temp at all. I was thinking of buying a tupperware container, but it seems kinda bulky. What kinds of bottles do other people use? And if you use soda bottles, how do you get the glue off?

 

[wildman117]

you can scrap off all the glue with a butter knife an if you are not comfortable with that you might try taking gallon ziplock bags and filling them with ice

 

[Hooked Newbie]

There are a couple brands that use a shrink wrap type label, that's easily removed without any residue, instead of the glued on paper type. That's what I used last year when my AC died. Also remember to add Prime or other dechlor to the water you freeze "just in case".

 

[Rbishop]

A lot of the larger water bottles, have that sleeve that just slips off. Alcohol would also remove the glue and not be a problem.

 

[KarlTh]

Besides, the glue's almost certainly non-toxic.

 

[jm1212]

you can also use ziploc bags. you'll have to be a little more careful with them, but it will work just as well and without the glue.

 

[LeahK]

Thanks for all the suggestions. I just picked up 4 of the shrink-wrap type water bottles. The label is adhered with 3 little dots of glue, but I think I can scrape it off or use alcohol like rbishop said.
My tank holding at about 80.5, which I think is ok for all my fish except the rosy barbs. For their sake, I'd be satisfied if I could keep it at 78 throughout the summer.