Cheeki products are not indestructible, they can dent when dropped. If you dropped your bottle and dented it, while it may never be in perfect shape again, the dent may be fixed. Simply place a thick towel onto a chopping a board. Put your bottle upside down on the and with a rubber mallet gently tap the bulge back into place. Do not use a metal object to brand the dent as the metal can get inside your Cheeki bottle. You may also further damage or even puncture your bottle.
Please note even with a dent your Cheeki product is totally safe to use. With no plastic liner on the inside a dent will not change the composition of the stainless steel or make it unsafe.