hi Crystalz, yup you will need transformer! u check yr slow cooker.. cos some produts are travel friendly and can allow you to use with different wattage.
ok if you are in Ximending, there shld be a Welcome or other supermarkets nearby. Just ask the hotel for info. If you need fresh foods like potatoes etc, can definitely find in the supermarket but hor... their rice is different cos they eat short grain rice so the porridge texture will not be like what we are used to over here.
I'm less familiar with ximending cos i used to live near Taipei 101. If all else fails and you die die need baby supplies, i know of a baby shop at junction of RenAi Road Sec 3 + KuangFu Nan Road Sec 1 - it located at the main road just above KFC (2nd flr). They have baby clothes, supplies, toys, strollers etc
Along KuangFu Nan road sec 1 (directly across from the Sun Yet Sun Memorial Hall) there is also a MOtherCare store. Its only 5 min walk from the bb supplies store.
Hope I didn't confuse you.. heehe