Alternative for Alka-Seltzer Gold?

Hello, all. I've just found out Alka-Seltzer Gold was discontinued again. What do you all take instead of it for herxes and to reduce fast heart rate? If you mix your own potassium bicarbonate, anhydrous citric acid, and heat-treated sodium bicarbonate, how do you measure it? I tried buying the three ingredients in bulk and mixing them, but the result made my stomach hurt. However, Amazon recommended the other two of the three ingredients after I ordered the first one, so other people must be doing it successfully.

I called Bayer and asked them to start manufacturing Alka-Seltzer Gold again, and they recommended me to ask others to call in and make the same request and tell why it is important. (Admin, if I need to delete this part, I'd be happy to do so.) They said that they recommend Alka-Seltzer Upset Stomach Relief, but it does not have potassium, and it has almost twice as much baking soda, and it's really not good to take too much antacids if your stomach does not need it.

Other electrolyte options would be great too. I'd like a lower-sugar option if possible, but anything that works would be helpful. As far as I know, stevia and artificial sweeteners can cause herxing, but small amounts are fine for me.

I don’t know if this is the same as ASG or not but I have used redmond relyte electrolytes and nutrality electrolytes. I haven’t used for herxes but I use for other things. Both have different flavours and sweetened with stevia but double check on this incase I’m wrong

I'm so desperate for the stuff as well..has anyone tried picot???