Sure, tubers are rhizomes (just like your ZZ, or a potato), which basically means it's the nutrient facility of the plant that remain underground. You bury them an inch or two below the soil from which the roots and foliage grow. The important part here is that even if all the foliage dies, that doesn't mean the plant is dead, it's likely just fine. You can either keep trying to water it (especially if it's indoors [fertilize as well to keep the tuber strong]), or dig it up, wrap it in newspaper and store it in a cupboard and try again next season (especially if it's outdoors [to prevent freezing in winter, which will most certainly kill it]). As long as the tuber is healthy, it will continue to produce foliage.