I am not sure that chewy tums would work, since they are supposed to be chewed up. You can get these at Walmart:
https://i5.walmartimages.com/asr/9e...8428b_1.10f3c5ef74fd609dd63938d953e04fd4.jpeg
https://i5.walmartimages.com/asr/9e...8428b_1.10f3c5ef74fd609dd63938d953e04fd4.jpeg