An alternative regimen might or might not offer the same level of potency. If treatment with ritonavir is marginal or beginning to fail, this is the time to switch. When switching, it might be wise to consider getting a resistance test done, if possible, to guide the next choice of therapy. If you really like the results you're getting with ritonavir, just stick with it and try to cope with the taste issue. If treatment is working and you can adhere well, try the liquid for a week to see if you can live with it.
Many people can.
Use of the liquid will only be temporary. If you find it unacceptable, almost any other protease inhibitor is a reasonable substitute. Unless you have developed resistance to ritonavir, you should be able to switch back to it whenever desired. If you have used all the drugs in your combination for a year or longer, consider changing all of them at once. These new drugs are currently available free of charge while awaiting final FDA approval.