There’s a relatively new form of magnesium available now in major stores: magnesium glycerophosphate in powder form.
I purchased this product from (of all places) Meijer for $11.99 (including a 50% off for second jar) and it yields a very nice, smooth tasteless texture when added to water. I have actually been enjoying the taste of water more with this form of magnesium added. Magnesium absorption from the glycerophosphate form is among the best, better than magnesium citrate, certainly better than magnesium chloride (often prescribed by doctors) and magnesium oxide. (It is unclear how it compares to malate or glycinate.)
Just to be safe and minimize the loose bowel effect, start with 1/2 teaspoon added to 8 ounces of drinking water; this provides 165 mg elemental magnesium. Drinking two 8-ounce glasses per day therefore adds 330 mg of magnesium. Increase the quantity of powder up to 1 teaspoon in 8 ounces water, if tolerated, twice per day to achieve ideal intake.
CVS also sells this form of magnesium for a similar price.
Those of you with need to restore magnesium to healthy levels rapidly, such as those with atrial fibrillation or other abnormal heart rhythms, bothersome leg cramps, migraine headaches, or osteopenia/osteoporosis, I believe that the Magnesium Water recipe that yields magnesium bicarbonate is still the best choice. But the glycerophosphate form is a nice second choice and, because it comes as a powder, is easily mixed into water or other liquids and avoids the large tablets or capsules that some people struggle with.